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James JJ, Satyamitra M, Hu T, Antinozzi P. Success! Disaster Med Public Health Prep 2024; 18:e73. [PMID: 38623739 DOI: 10.1017/dmp.2023.242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Affiliation(s)
- James J James
- Editor-in-Chief, Society for Disaster Medicine and Public Health, Inc., Queen Creek, Arizona
| | - Merriline Satyamitra
- Radiation and Nuclear Countermeasure Program DAIT/NIAID/NIH5601, Rockville, MD20852, US
| | - Tom Hu
- Pulmonary and Sleep Medicine Associate Director, Center for Advanced Drug Development, Department of Pediatrics, University of Colorado School of Medicine, Aurora, CO, US
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Sala C, Tarozzi M, Simonetti G, Pazzaglia M, Cammarata FP, Russo G, Acquaviva R, Cirrone GAP, Petringa G, Catalano R, Elia VC, Fede F, Manti L, Castellani G, Remondini D, Zironi I. Impact on the Transcriptome of Proton Beam Irradiation Targeted at Healthy Cardiac Tissue of Mice. Cancers (Basel) 2024; 16:1471. [PMID: 38672554 PMCID: PMC11048382 DOI: 10.3390/cancers16081471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2024] [Revised: 03/20/2024] [Accepted: 04/02/2024] [Indexed: 04/28/2024] Open
Abstract
Proton beam therapy is considered a step forward with respect to electromagnetic radiation, thanks to the reduction in the dose delivered. Among unwanted effects to healthy tissue, cardiovascular complications are a known long-term radiotherapy complication. The transcriptional response of cardiac tissue from xenografted BALB/c nude mice obtained at 3 and 10 days after proton irradiation covering both the tumor region and the underlying healthy tissue was analyzed as a function of dose and time. Three doses were used: 2 Gy, 6 Gy, and 9 Gy. The intermediate dose had caused the greatest impact at 3 days after irradiation: at 2 Gy, 219 genes were differently expressed, many of them represented by zinc finger proteins; at 6 Gy, there were 1109, with a predominance of genes involved in energy metabolism and responses to stimuli; and at 9 Gy, there were 105, mainly represented by zinc finger proteins and molecules involved in the regulation of cardiac function. After 10 days, no significant effects were detected, suggesting that cellular repair mechanisms had defused the potential alterations in gene expression. The nonlinear dose-response curve indicates a need to update the models built on photons to improve accuracy in health risk prediction. Our data also suggest a possible role for zinc finger protein genes as markers of proton therapy efficacy.
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Affiliation(s)
- Claudia Sala
- Department of Medical and Surgical Sciences (DIMEC), Alma Mater Studiorum University of Bologna, 40127 Bologna, Italy; (C.S.); (G.C.)
| | - Martina Tarozzi
- Department of Medical and Surgical Sciences (DIMEC), Alma Mater Studiorum University of Bologna, 40127 Bologna, Italy; (C.S.); (G.C.)
| | - Giorgia Simonetti
- Biosciences Laboratory, IRCCS Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST) “Dino Amadori”, 47014 Meldola, Italy; (G.S.)
| | - Martina Pazzaglia
- Biosciences Laboratory, IRCCS Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST) “Dino Amadori”, 47014 Meldola, Italy; (G.S.)
| | - Francesco Paolo Cammarata
- Institute of Bioimaging and Molecular Physiology, National Council of Research (IBFM-CNR), 90015 Cefalù, Italy (G.R.)
- Laboratori Nazionali del SUD, National Institute of Nuclear Physics, (LNS-INFN), 95125 Catania, Italy (G.P.)
| | - Giorgio Russo
- Institute of Bioimaging and Molecular Physiology, National Council of Research (IBFM-CNR), 90015 Cefalù, Italy (G.R.)
- Laboratori Nazionali del SUD, National Institute of Nuclear Physics, (LNS-INFN), 95125 Catania, Italy (G.P.)
| | - Rosaria Acquaviva
- Department of Drug Science, Section of Biochemistry, University of Catania, 95125 Catania, Italy;
| | | | - Giada Petringa
- Laboratori Nazionali del SUD, National Institute of Nuclear Physics, (LNS-INFN), 95125 Catania, Italy (G.P.)
| | - Roberto Catalano
- Laboratori Nazionali del SUD, National Institute of Nuclear Physics, (LNS-INFN), 95125 Catania, Italy (G.P.)
| | - Valerio Cosimo Elia
- Department of Physics “E. Pancini”, University of Naples Federico II, 80126 Naples, Italy; (V.C.E.); (F.F.); (L.M.)
- National Institute of Nuclear Physics, Napoli Section (INFN NA), 80126 Naples, Italy
| | - Francesca Fede
- Department of Physics “E. Pancini”, University of Naples Federico II, 80126 Naples, Italy; (V.C.E.); (F.F.); (L.M.)
- National Institute of Nuclear Physics, Napoli Section (INFN NA), 80126 Naples, Italy
| | - Lorenzo Manti
- Department of Physics “E. Pancini”, University of Naples Federico II, 80126 Naples, Italy; (V.C.E.); (F.F.); (L.M.)
- National Institute of Nuclear Physics, Napoli Section (INFN NA), 80126 Naples, Italy
| | - Gastone Castellani
- Department of Medical and Surgical Sciences (DIMEC), Alma Mater Studiorum University of Bologna, 40127 Bologna, Italy; (C.S.); (G.C.)
| | - Daniel Remondini
- National Institute for Nuclear Physics, Bologna Section (INFN BO), 40127 Bologna, Italy
- Department of Physics and Astronomy “Augusto Righi” (DIFA), Alma Mater Studiorum University of Bologna, 40127 Bologna, Italy
| | - Isabella Zironi
- National Institute for Nuclear Physics, Bologna Section (INFN BO), 40127 Bologna, Italy
- Department of Physics and Astronomy “Augusto Righi” (DIFA), Alma Mater Studiorum University of Bologna, 40127 Bologna, Italy
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Sun M, Moquet J, Barnard S, Mancey H, Burling D, Baldwin-Cleland R, Monahan K, Latchford A, Lloyd D, Bouffler S, Badie C, Anyamene NA, Ainsbury E. In vitro study of radiosensitivity in colorectal cancer cell lines associated with Lynch syndrome. Front Public Health 2024; 12:1369201. [PMID: 38638480 PMCID: PMC11024246 DOI: 10.3389/fpubh.2024.1369201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Accepted: 03/18/2024] [Indexed: 04/20/2024] Open
Abstract
Introduction Lynch syndrome patients have an inherited predisposition to cancer due to a deficiency in DNA mismatch repair (MMR) genes which could lead to a higher risk of developing cancer if exposed to ionizing radiation. This pilot study aims to reveal the association between MMR deficiency and radiosensitivity at both a CT relevant low dose (20 mGy) and a therapeutic higher dose (2 Gy). Methods Human colorectal cancer cell lines with (dMMR) or without MMR deficiency (pMMR) were analyzed before and after exposure to radiation using cellular and cytogenetic analyses i.e., clonogenic assay to determine cell reproductive death; sister chromatid exchange (SCE) assay to detect the exchange of DNA between sister chromatids; γH2AX assay to analyze DNA damage repair; and apoptosis analysis to compare cell death response. The advantages and limitations of these assays were assessed in vitro, and their applicability and feasibility investigated for their potential to be used for further studies using clinical samples. Results Results from the clonogenic assay indicated that the pMMR cell line (HT29) was significantly more radio-resistant than the dMMR cell lines (HCT116, SW48, and LoVo) after 2 Gy X-irradiation. Both cell type and radiation dose had a significant effect on the yield of SCEs/chromosome. When the yield of SCEs/chromosome for the irradiated samples (2 Gy) was normalized against the controls, no significant difference was observed between the cell lines. For the γH2AX assay, 0, 20 mGy and 2 Gy were examined at post-exposure time points of 30 min (min), 4 and 24 h (h). Statistical analysis revealed that HT29 was only significantly more radio-resistant than the MLH1-deficient cells lines, but not the MSH2-deficient cell line. Apoptosis analysis (4 Gy) revealed that HT29 was significantly more radio-resistant than HCT116 albeit with very few apoptotic cells observed. Discussion Overall, this study showed radio-resistance of the MMR proficient cell line in some assays, but not in the others. All methods used within this study have been validated; however, due to the limitations associated with cancer cell lines, the next step will be to use these assays in clinical samples in an effort to understand the biological and mechanistic effects of radiation in Lynch patients as well as the health implications.
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Affiliation(s)
- Mingzhu Sun
- United Kingdom Health Security Agency, Department of Radiation Effects, Cytogenetics and Pathology Group, Radiation, Chemical and Environmental Hazards Directorate, Didcot, United Kingdom
| | - Jayne Moquet
- United Kingdom Health Security Agency, Department of Radiation Effects, Cytogenetics and Pathology Group, Radiation, Chemical and Environmental Hazards Directorate, Didcot, United Kingdom
| | - Stephen Barnard
- United Kingdom Health Security Agency, Department of Radiation Effects, Cytogenetics and Pathology Group, Radiation, Chemical and Environmental Hazards Directorate, Didcot, United Kingdom
| | - Hannah Mancey
- United Kingdom Health Security Agency, Department of Radiation Effects, Cytogenetics and Pathology Group, Radiation, Chemical and Environmental Hazards Directorate, Didcot, United Kingdom
| | - David Burling
- Intestinal Imaging Centre, St Mark's Hospital, London North West University Healthcare National Health Service Trust, Harrow, United Kingdom
| | - Rachel Baldwin-Cleland
- Intestinal Imaging Centre, St Mark's Hospital, London North West University Healthcare National Health Service Trust, Harrow, United Kingdom
| | - Kevin Monahan
- Lynch Syndrome Clinic, Centre for Familial Intestinal Cancer, St Mark's Hospital, London North West University Healthcare National Health Service Trust, Harrow, United Kingdom
| | - Andrew Latchford
- Lynch Syndrome Clinic, Centre for Familial Intestinal Cancer, St Mark's Hospital, London North West University Healthcare National Health Service Trust, Harrow, United Kingdom
| | - David Lloyd
- United Kingdom Health Security Agency, Department of Radiation Effects, Cytogenetics and Pathology Group, Radiation, Chemical and Environmental Hazards Directorate, Didcot, United Kingdom
| | - Simon Bouffler
- United Kingdom Health Security Agency, Department of Radiation Effects, Cytogenetics and Pathology Group, Radiation, Chemical and Environmental Hazards Directorate, Didcot, United Kingdom
| | - Christophe Badie
- United Kingdom Health Security Agency, Department of Radiation Effects, Cytogenetics and Pathology Group, Radiation, Chemical and Environmental Hazards Directorate, Didcot, United Kingdom
| | - Nicola A. Anyamene
- East and North Hertfordshire National Health Service Trust, Mount Vernon Cancer Centre, Northwood, United Kingdom
| | - Elizabeth Ainsbury
- United Kingdom Health Security Agency, Department of Radiation Effects, Cytogenetics and Pathology Group, Radiation, Chemical and Environmental Hazards Directorate, Didcot, United Kingdom
- Environmental Research Group Within the School of Public Health, Faculty of Medicine at Imperial College of Science, Technology and Medicine, London, United Kingdom
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Martin CJ, Barnard M, de Vocht F. Evaluation of risks of cardiovascular disease from radiation exposure linked to computed tomography scans in the UK. J Radiol Prot 2024; 44:011513. [PMID: 38422514 DOI: 10.1088/1361-6498/ad2ebd] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Accepted: 02/29/2024] [Indexed: 03/02/2024]
Abstract
Epidemiological studies of patient populations have shown that high doses of radiation increase risks of cardiovascular disease (CVD). Results from a recent meta-analysis of 93 epidemiological studies covering a wide range of doses provided evidence of a causal association between radiation exposure and CVD, and indicated excess relative risk per Gy for maximum dose below 500 mGy or delivered at low dose rates. These doses cover the range of organ doses expected from multiple diagnostic computed tomography (CT) scans. Dose-effect factors for the excess absolute risk of mortality from CVD following radiation exposure were derived from the meta-analysis. The present study uses these factors to estimate excess risks of mortality for various types of CVD, including cerebrovascular disease (CeVD), from CT scans of the body and head, assuming that the meta-analytic factors were accurate and represented a causal relationship. Estimates are based on cumulative doses to the heart and brain from CT scans performed on 105 574 patients on 12 CT scanners over a period of 5½ years. The results suggest that the excess number of deaths from CeVD could be 7 or 26 per 100 000 patients depending whether threshold brain doses of 200 mGy or 50 mGy, respectively are assumed. These results could have implications for head CT scans. However, the results rely on the validity of risk factors derived in the meta-analysis informing this assessment and which include significant uncertainties. Further incidence studies should provide better information on risk factors and dose thresholds, particularly for CeVD following head CT scans.
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Affiliation(s)
- Colin J Martin
- Department of Clinical Physics and Bioengineering, University of Glasgow, Glasgow, United Kingdom
| | - Michael Barnard
- Department of Radiation Physics and Protection, Oxford University Hospitals NHS Foundation Trust, Oxford, United Kingdom
| | - Frank de Vocht
- Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, United Kingdom
- NIHR Applied Research Collaboration West (ARC West), Bristol, United Kingdom
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Doyle E, Dimmock MR, Lee KL, Thomas P, Bassed RB. Comparison of typical radiation doses and risks using an anthropomorphic 'bone fracture' phantom for commonly performed X-ray projections in a 5-year-old. J Med Radiat Sci 2024; 71:35-43. [PMID: 37602665 PMCID: PMC10920946 DOI: 10.1002/jmrs.717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 08/05/2023] [Indexed: 08/22/2023] Open
Abstract
INTRODUCTION Diagnostic reference levels (DRLs) are typical dose levels for medical imaging examinations for groups of standard-sized patients or standard phantoms for broadly defined types of equipment used as a tool to aid optimisation of protection for medical exposures. Currently, there are no paediatric DRLs for conventional radiography (i.e. general X-rays) published in Australia. The aim of this study was to establish typical radiation doses and risks that are representative of those delivered for commonly performed X-ray projections for a 5-year-old/20 kg child using a 5-year-old anthropomorphic 'bone fracture' phantom in three dedicated paediatric radiology departments in Victoria. METHODS A total of 20 projection images were acquired for a standard 5-year-old/20 kg phantom using digital radiography X-ray equipment. The air kerma-area product (KAP) measured at each centre by a KAP metre, which was calibrated to a national primary standard, was considered to represent the median value for that centre for each X-ray projection. Organ doses and effective dose were estimated using PCXMC software, and risks of radiation-induced cancer and radiation-induced death were calculated based on the BEIR VII report. RESULTS The typical doses for the individual X-ray projections ranged from 3 mGy•cm2 to 86 mGy•cm2 , whilst the effective doses ranged from 0.00004 to 0.07 mSv. The radiation risks were 'minimal' to 'negligible'. CONCLUSION The estimation of typical radiation doses and associated risks for a 5-year-old/20 kg phantom study provides reference values for guidance and is a first step in assisting optimisation at other institutions until national DRLs, based on patient data from the clinical setting, are published.
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Affiliation(s)
- Edel Doyle
- Department of Forensic MedicineMonash UniversityMelbourneVictoriaAustralia
| | - Matthew R Dimmock
- Department of Medical Imaging and Radiation SciencesMonash UniversityMelbourneVictoriaAustralia
- School of Allied Health ProfessionsKeele UniversityKeeleUK
| | - Kam L Lee
- Australian Radiation Protection and Nuclear Safety AgencyYallambieVictoriaAustralia
| | - Peter Thomas
- Australian Radiation Protection and Nuclear Safety AgencyYallambieVictoriaAustralia
| | - Richard B Bassed
- Department of Forensic MedicineMonash UniversityMelbourneVictoriaAustralia
- Victorian Institute of Forensic MedicineAcademic ProgramsMelbourneVictoriaAustralia
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Holovach PG, Hsu WW, Fleischer AB. Number Bias in Clinicians' Documentation of Actinic Keratosis Removal. J Clin Med 2023; 13:202. [PMID: 38202208 PMCID: PMC10779529 DOI: 10.3390/jcm13010202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 12/22/2023] [Accepted: 12/27/2023] [Indexed: 01/12/2024] Open
Abstract
BACKGROUND Actinic keratosis (AK) is a pre-cancerous skin condition caused by sun exposure. Number bias, a phenomenon that occurs when meaning other than numerical value is associated with numbers, may influence the reporting of AK removal. The present study aims to determine if number bias is affecting healthcare providers' documentation of patient-provider encounters. METHODS A single-center retrospective chart review of 1415 patients' charts was conducted at the University of Cincinnati Medical Center. To determine if there was a significant difference between even and odd-numbered AK removals reported, an exact binomial test was used. The frequency of removals per encounter was fitted to a zero-truncated negative binomial distribution to predict the number of removals expected. All data were analyzed with RStudio. RESULTS There were 741 odd and 549 even encounters. Odd removals were reported at a significantly greater frequency than even p < 0.001. Age may be contributing to the observed number bias (p < 0.001). One, two, and eight were reportedly removed more frequently, while nine, 13, and 14 were reportedly removed less frequently than expected, respectively. CONCLUSION Number bias may be affecting clinicians' documentation of AK removal and should be investigated in other clinical settings.
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Affiliation(s)
- Phillip G. Holovach
- Medical School, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Wei-Wen Hsu
- Division of Biostatistics and Bioinformatics, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA;
| | - Alan B. Fleischer
- Department of Dermatology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA;
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Bazyka DA, Sushko VO, Chumak AA, Fedirko PA, Talko VV, Yanovych LA. STATE INSTITUTION «NATIONAL RESEARCH CENTER FOR RADIATION MEDICINE OF THE NATIONAL ACADEMY OF MEDICAL SCIENCES OF UKRAINE» - RESEARCH ACTIVITIES AND SCIENTIFIC ADVANCE IN 2022. Probl Radiac Med Radiobiol 2023; 28:10-21. [PMID: 38155112 DOI: 10.33145/2304-8336-2023-28-10-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Indexed: 12/30/2023]
Abstract
Research activities and scientific advance achieved in 2022 at the State Institution «National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine» (NRCRM) concerning medical problems of the Chornobyl disaster, radiation medicine, radiobiology, radiation hygiene and epidemiology in collaboration with the WHO network of medical preparedness and assistance in radiation accidents are outlined in the annual report. The report presents the results of fundamental and applied research works of the study of radiation effects and health effects of the Chornobyl accident. The report also shows the results of scientificorganizational and health care work, staff training. The Scientific Council meeting of NAMS approved the NRCRM Annual Report.
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Affiliation(s)
- D A Bazyka
- State Institution «National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine», 53 Yuriia Illienka St., Kyiv, 04050, Ukraine
| | - V O Sushko
- State Institution «National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine», 53 Yuriia Illienka St., Kyiv, 04050, Ukraine
| | - A A Chumak
- State Institution «National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine», 53 Yuriia Illienka St., Kyiv, 04050, Ukraine
| | - P A Fedirko
- State Institution «National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine», 53 Yuriia Illienka St., Kyiv, 04050, Ukraine
| | - V V Talko
- State Institution «National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine», 53 Yuriia Illienka St., Kyiv, 04050, Ukraine
| | - L A Yanovych
- State Institution «National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine», 53 Yuriia Illienka St., Kyiv, 04050, Ukraine
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Feighan L, MacDonald‐Wicks L, Callister R, Surjan Y. Practitioner perceptions on the use of exercise and nutritional interventions for patients with breast cancer receiving radiation therapy. J Med Radiat Sci 2023; 70:444-453. [PMID: 37559550 PMCID: PMC10715360 DOI: 10.1002/jmrs.713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Accepted: 07/26/2023] [Indexed: 08/11/2023] Open
Abstract
INTRODUCTION Radiation therapy treatment for breast cancer may negatively impact patients' health-related quality of life. Evidence suggests exercise and nutrition interventions may be beneficial to patients experiencing compromised health-related quality of life. This study investigates whether radiation oncology practitioners support the implementation of a tailored exercise and nutrition intervention for patients and explores their interest in participating in training for exercise and nutrition as interventions. METHODS Data were collected by an online survey, deployed to public and private radiation oncology departments, across three Australian states (Australian Capital Territory, New South Wales, Queensland). The survey was completed between June and August 2020. Radiation oncologists, radiation oncology registrars, radiation therapists and radiation oncology nurses completed the survey. The survey included demographics, patient assessment and questions regarding the radiation oncology practitioners' use of exercise and nutrition as interventions. RESULTS Of 192 practitioners targeted, 76 completed the survey, for a response rate of 40%. Of 76 respondents, 42% 'sometimes' recommended exercise and 41% 'sometimes' recommended nutrition as health-related quality of life interventions to their patients. The majority indicated they would benefit from more training in these subjects, with 58% for exercise and 55% for nutrition. 47 per cent of respondents thought patients would benefit from a tailored exercise and nutrition programme and 62% agreed they would refer patients to a programme if it were available. CONCLUSIONS Radiation oncology practitioners reported they need training in exercise and nutrition to better understand how this can benefit the health-related quality of life of breast cancer patients. Also, the findings indicate that if such an exercise and nutrition intervention were readily available, practitioners would refer patients who may benefit from this intervention.
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Affiliation(s)
- Laura Feighan
- Global Centre for Research and Training in Radiation Oncology, School of Health Sciences, College of Health, Medicine, and WellbeingThe University of NewcastleCallaghanNew South WalesAustralia
| | - Lesley MacDonald‐Wicks
- School of Health Sciences, College of Health, Medicine, and WellbeingThe University of NewcastleCallaghanNew South WalesAustralia
| | - Robin Callister
- School of Biomedical Sciences and Pharmacy, College of Health, Medicine, and WellbeingThe University of NewcastleCallaghanNew South WalesAustralia
| | - Yolanda Surjan
- Global Centre for Research and Training in Radiation Oncology, School of Health Sciences, College of Health, Medicine, and WellbeingThe University of NewcastleCallaghanNew South WalesAustralia
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Krajewska G, Krajewski P. Evaluation of internal exposure of nuclear medicine staff working with radioiodine in Poland. Int J Occup Med Environ Health 2023; 36:587-595. [PMID: 37768025 DOI: 10.13075/ijomeh.1896.02136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/29/2023] Open
Abstract
The iodine-131 (I-131) content in the thyroid of staff members working with this radionuclides has been measured with about 500 employees in about 25 hospital's departments of nuclear medicine performing therapy and diagnosis of thyroid disease in Poland. The measurements were performed with portable detection unit for in situ measurements of radioiodine. This is consist with scintillation detector sodium iodine activated by thallium (NaI(Tl)) - battery-powered and portable tube base Multichannel Analyzer Canberra UniSPEC. Based on direct measurements of the iodine content, the effective dose equivalent for workers due to inhalation of I-131 was estimated. All individuals actively working with iodine show measurable amounts of this isotopes in their thyroids. The average measured activity in the thyroid of the nuclear medicine staff was found to be equal at average 550 Bq within the range 70 Bq-2.5 kBq. There is no apparent correlation between the measured I-131 levels and risk categories. Nevertheless the technical and nuclear medicine staff show higher I-131 thyroid level comparing to hospital services staff. Calculated maximum committed effective dose for particular exposed person is <10% of 20 mSv/year. Int J Occup Med Environ Health. 2023;36(5):587-95.
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Affiliation(s)
| | - Paweł Krajewski
- Central Laboratory for Radiological Protection, Warsaw, Poland
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Ansari A, Salame-Alfie A, Dopson SA. Centers for Disease Control and Prevention Participation in Cobalt Magnet National-Level Radiological Exercise. Disaster Med Public Health Prep 2023; 17:e472. [PMID: 37646314 PMCID: PMC10600794 DOI: 10.1017/dmp.2023.131] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Since September 11, 2001, the Centers for Disease Control and Prevention (CDC) has increased efforts to prepare the agency and public health partners for response to potential nuclear/radiological disasters. During the week of May 16-20, 2022, the CDC participated in a national-level radiological emergency exercise, Cobalt Magnet 22 (CM22). The exercise scenario consisted of a notional, failed search mission for a radiological dispersal device (RDD, "dirty bomb"), followed by its explosion during a public event in a large US city. Testing radioanalytical laboratory capabilities during a nuclear/radiological incident was an exercise objective, and developing clear messaging on low-dose exposure and long-term health concerns was a primary output of the exercise. The CDC practiced its activation protocols, exercised the establishment of its updated Incident Management System structure for radiation emergencies, and identified critical staffing needs for this type of response.
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Affiliation(s)
- Armin Ansari
- Centers for Disease Control and Prevention, Atlanta, United States
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Ho HH, Tsai HT. Unmasking the Hidden Fetus: Introducing the Circled Delta Sign and Reversed Circled Delta Sign for Accurate Identification on Abdominal Radiography. Am J Case Rep 2023; 24:e940689. [PMID: 37621077 PMCID: PMC10461323 DOI: 10.12659/ajcr.940689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 07/17/2023] [Accepted: 07/08/2023] [Indexed: 08/26/2023]
Abstract
BACKGROUND Ionizing radiation poses potential health risk to fetuses, including growth retardation, organ malformations, neurological effects, fetal death, and cancer. Therefore, pregnant women rarely undergo X-ray imaging, unless absolutely necessary. However, they can be inadvertently exposed to X-rays while undergoing an examination without being aware of their pregnancy. Given that the likelihood of a fetus appearing on an abdominal radiograph is low, physicians can be unfamiliar with the appearance of a fetus on such images. If a fetus incidentally appears on an abdominal radiograph, the clinician can encounter difficulties in identifying the fetus, potentially leading to unexpected harm during subsequent imaging procedures. CASE REPORT A 41-year-old woman presented with symptoms of postprandial abdominal pain, abdominal fullness, and urinary frequency. Abdominal radiography revealed a large mass with calcifications in the pelvis and lower abdomen, raising suspicion of a large pelvic tumor, such as a teratoma. However, subsequent ultrasound unexpectedly revealed that the woman was actually 6 months pregnant. The presumed tumor was an enlarged uterus, and the presumed calcifications were the fetus's bones. Before X-ray, the woman had denied being pregnant, mistakenly attributing her condition to excess weight and irregular menstrual cycles. Fortunately, the use of ultrasound instead of computed tomography prevented radiation exposure to the fetus, and the baby was delivered in a healthy state at full term. CONCLUSIONS To avoid unintended harm to fetuses, clinicians should consider the possibility of pregnancy when evaluating a pelvic mass in women of childbearing age. To aid clinicians in accurately identifying fetuses on abdominal radiography and thereby reduce the likelihood of misdiagnosis, we propose the "circled delta sign" and the "reversed circled delta sign".
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Affiliation(s)
- Hsing-Hao Ho
- Department of Radiology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Hsiu-Ting Tsai
- Department of Obstetrics and Gynecology, Tri-Service General Hospital Penghu Branch, Penghu, Taiwan
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Hidaka T, Kakamu T, Endo S, Kasuga H, Masuishi Y, Fukushima T. Returning to a Once Highly Contaminated Homeland in Fukushima in 2023: Resident Concerns of Agricultural Accident and Public Safety. Disaster Med Public Health Prep 2023; 17:e449. [PMID: 37565346 DOI: 10.1017/dmp.2023.113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Affiliation(s)
- Tomoo Hidaka
- Department of Hygiene and Preventive Medicine, School of Medicine, Fukushima Medical University, Fukushima, Japan
| | - Takeyasu Kakamu
- Department of Hygiene and Preventive Medicine, School of Medicine, Fukushima Medical University, Fukushima, Japan
| | - Shota Endo
- Department of Hygiene and Preventive Medicine, School of Medicine, Fukushima Medical University, Fukushima, Japan
| | - Hideaki Kasuga
- Department of Hygiene and Preventive Medicine, School of Medicine, Fukushima Medical University, Fukushima, Japan
| | - Yusuke Masuishi
- Department of Hygiene and Preventive Medicine, School of Medicine, Fukushima Medical University, Fukushima, Japan
| | - Tetsuhito Fukushima
- Department of Hygiene and Preventive Medicine, School of Medicine, Fukushima Medical University, Fukushima, Japan
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13
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Soares CBG, Araújo IDD, Teixeira LEM, Michelin MA, Machado CJ, Silveira MP. Fracture in Irradiated Rat Femur: A Description of an Experimental Model and Evaluation of its Effectiveness. Rev Bras Ortop 2023; 58:e653-e658. [PMID: 37663191 PMCID: PMC10468228 DOI: 10.1055/s-0042-1758359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 09/12/2022] [Indexed: 09/05/2023] Open
Abstract
Objective We aim to describe an experimental model for studying femoral fractures in rats after exposure to ionizing radiation, demonstrating a way to apply a substance for analysis, the method for patterning fracture and irradiation, and how to evaluate its effectiveness based on radiographic studies. Methods We used 24 rats divided into 2 groups of 12 animals each. The STUDY group was exposed to ionizing radiation and treated with saline solution, and the CONTROL group was not exposed to radiation and was treated with saline solution. All animals were subjected to standardized fracture of the right femur that was fixed with intramedullary wire. The efficiency of the bone union was assessed by radiographic exam. Results Fracture healing was more efficient in bones not exposed to ionizing radiation ( p = 0.012). All fractures met the criteria of being simple, diaphyseal, transverse or short oblique. Conclusion The experimental model presented is an efficient alternative for the study of fractures in irradiated bones in rats.
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Affiliation(s)
- Cláudio Beling Gonçalves Soares
- Médico Preceptor, Departamento de Cirurgia, Faculdade de Medicina Federal, Universidade de Minas Gerais, Belo Horizonte, MG, Brasil
| | - Ivana Duval de Araújo
- Professor, Departamento de Cirurgia, Faculdade de Medicina, Universidade Federal, Minas Gerais, Belo Horizonte, MG, Brasil
| | - Luiz Eduardo Moreira Teixeira
- Professor, Departamento de Cirurgia, Faculdade de Medicina, Universidade Federal, Minas Gerais, Belo Horizonte, MG, Brasil
| | | | - Carla Jorge Machado
- Professor, Departamento de Cirurgia, Faculdade de Medicina, Universidade Federal, Minas Gerais, Belo Horizonte, MG, Brasil
| | - Marcelo Peixoto Silveira
- Médico Ortopedista, Departamento de Ortopedia, Faculdade de Medicina, Federal, Universidade de Minas Gerais, Belo Horizonte, MG, Brasil
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14
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Colmenares R, Carrión-Marchante R, Martín ME, Salinas Muñoz L, García-Bermejo ML, Oller JC, Muñoz A, Blanco F, Rosado J, Lozano AI, Álvarez S, García-Vicente F, García G. Dependence of Induced Biological Damage on the Energy Distribution and Intensity of Clinical Intra-Operative Radiotherapy Electron Beams. Int J Mol Sci 2023; 24:10816. [PMID: 37445992 DOI: 10.3390/ijms241310816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 06/21/2023] [Accepted: 06/23/2023] [Indexed: 07/15/2023] Open
Abstract
The survival fraction of epithelial HaCaT cells was analysed to assess the biological damage caused by intraoperative radiotherapy electron beams with varying energy spectra and intensities. These conditions were achieved by irradiating the cells at different depths in water using nominal 6 MeV electron beams while consistently delivering a dose of 5 Gy to the cell layer. Furthermore, a Monte Carlo simulation of the entire irradiation procedure was performed to evaluate the molecular damage in terms of molecular dissociations induced by the radiation. A significant agreement was found between the molecular damage predicted by the simulation and the damage derived from the analysis of the survival fraction. In both cases, a linear relationship was evident, indicating a clear tendency for increased damage as the averaged incident electron energy and intensity decreased for a constant absorbed dose, lowering the dose rate. This trend suggests that the radiation may have a more pronounced impact on surrounding healthy tissues than initially anticipated. However, it is crucial to conduct additional experiments with different target geometries to confirm this tendency and quantify the extent of this effect.
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Affiliation(s)
- Rafael Colmenares
- Servicio de Radiofísica, IRYCIS-Hospital Universitario Ramón y Cajal, Carretera de Colmenar Viejo km 9100, 28034 Madrid, Spain
| | - Rebeca Carrión-Marchante
- Grupo de Aptámeros, Departamento de Bioquímica-Investigación, IRYCIS-Hospital Universitario Ramón y Carretera de Colmenar Viejo km 9100, 28034 Madrid, Spain
| | - M Elena Martín
- Grupo de Aptámeros, Departamento de Bioquímica-Investigación, IRYCIS-Hospital Universitario Ramón y Carretera de Colmenar Viejo km 9100, 28034 Madrid, Spain
| | - Laura Salinas Muñoz
- Biomarkers and Therapeutic Targets Group, IRYCIS, RedinREN, Hospital Universitario Ramón y Cajal, Carretera de Colmenar km 9100, 28034 Madrid, Spain
| | - María Laura García-Bermejo
- Biomarkers and Therapeutic Targets Group, IRYCIS, RedinREN, Hospital Universitario Ramón y Cajal, Carretera de Colmenar km 9100, 28034 Madrid, Spain
| | - Juan C Oller
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas-CIEMAT, 28040 Madrid, Spain
| | - Antonio Muñoz
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas-CIEMAT, 28040 Madrid, Spain
| | - Francisco Blanco
- Departamento de Estructura de la Materia, Física Térmica y Electrónica e IPARCOS, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Jaime Rosado
- Departamento de Estructura de la Materia, Física Térmica y Electrónica e IPARCOS, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Ana I Lozano
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, 28006 Madrid, Spain
| | - Sofía Álvarez
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, 28006 Madrid, Spain
| | - Feliciano García-Vicente
- Servicio de Radiofísica, IRYCIS-Hospital Universitario Ramón y Cajal, Carretera de Colmenar Viejo km 9100, 28034 Madrid, Spain
| | - Gustavo García
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, 28006 Madrid, Spain
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW 2522, Australia
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15
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Matsumoto H, Shinya Y, Miyawaki S, Shin M, Koizumi S, Sato D, Hinata M, Ikemura M, Kiyofuji S, Kin T, Iwanaga M, Shimizu M, Nakatomi H, Saito N. White epidermoid cyst transformation after stereotactic radiosurgery: illustrative case. J Neurosurg Case Lessons 2023; 5:CASE2376. [PMID: 37334973 PMCID: PMC10550655 DOI: 10.3171/case2376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Accepted: 05/04/2023] [Indexed: 06/21/2023]
Abstract
BACKGROUND White epidermoid cysts (WECs) are a rare type of epidermoid cyst with atypical radiological features. The epidemiological aspects and mechanisms of their onset remain unknown. Herein, the authors report a unique case of WEC transformation from a typical epidermoid cyst after stereotactic radiosurgery (SRS), confirmed by radiological and pathological findings. OBSERVATIONS The case involved a 78-year-old man with a history of 2 surgeries for a left cerebellopontine angle typical epidermoid cyst 23 years earlier and SRS using the CyberKnife for recurrent trigeminal neuralgia (TN) 14 years earlier. The tumor with high intensity on T1-weighted imaging, low intensity on T2-weighted imaging, without restriction on diffusion-weighted imaging had gradually enlarged after SRS. Therefore, a salvage surgery was performed via a left suboccipital craniotomy, and the intraoperative findings showed a cyst with a brown, viscous liquid component, consistent with those of WECs. Histopathologically, keratin calcification and hemorrhage were identified, leading to a diagnosis of WEC. The postoperative course was uneventful, and the TN resolved. No tumor recurrence was recorded at 2 years postoperatively. LESSONS To the best of the authors' knowledge, this is the first world case of WEC transformation from a typical epidermoid cyst after SRS, confirmed by radiological and pathological findings. Radiation effects could have been involved in this transformation.
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Affiliation(s)
| | | | | | - Masahiro Shin
- Departments of Neurosurgery and
- Department of Neurosurgery, Teikyo University Hospital, Tokyo, Japan
| | | | | | | | - Masako Ikemura
- Pathology, The University of Tokyo Hospital, Tokyo, Japan
| | | | | | - Mototaro Iwanaga
- Department of Neurosurgery, Kanto Neurosurgical Hospital, Kumagaya, Japan; and
| | - Masahiro Shimizu
- Department of Neurosurgery, Kanto Neurosurgical Hospital, Kumagaya, Japan; and
| | - Hirofumi Nakatomi
- Departments of Neurosurgery and
- Department of Neurosurgery, Kyorin University Hospital, Tokyo, Japan
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Sattar Y, Sengodan PM, Cheema MS, Javed N, Ashraf S, Fakhra S, Alharbi A, Syed M, Alam M, Elgendy IY, Haleem A, Kawsara A, Alraies MC, Daggubati R. Lead Cap Use in Interventional Cardiology: Time to Protect Our Head in the Cardiac Catheterisation Laboratory? Interv Cardiol 2023; 18:e18. [PMID: 37435603 PMCID: PMC10331561 DOI: 10.15420/icr.2023.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 03/27/2023] [Indexed: 07/13/2023] Open
Abstract
Background: Radiation exposure is an occupational hazard for interventional cardiologists and cardiac catheterisation laboratory staff that can manifest with serious long-term health consequences. Personal protective equipment, including lead jackets and glasses, is common, but the use of radiation protective lead caps is inconsistent. Methods: A systematic review qualitative assessment of five observational studies using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines protocol was performed. Results: It was concluded that lead caps significantly reduce radiation exposure to the head, even when a ceiling-mounted lead shield was present. Conclusion: Although newer protective systems are being studied and introduced, tools, such as lead caps, need to be strongly considered and employed in the catheterisation laboratory as mainstay personal protective equipment.
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Affiliation(s)
- Yasar Sattar
- Department of Cardiology, West Virginia UniversityMorgantown, WV, US
| | | | - Mustafa Sajjad Cheema
- Department of Medicine, CMH Lahore Medical College and Institute of DentistryLahore, Punjab, Pakistan
| | - Nismat Javed
- Department of Internal Medicine, BronxCare Health SystemNew York, NY, US
| | - Shoaib Ashraf
- Department of Cardiology, Hackensack University Medical CentreNJ, US
| | - Sadaf Fakhra
- Department of Internal Medicine, University of Nevada, Kirk Kerkorian School of MedicineLas Vegas, NV, US
| | - Anas Alharbi
- Department of Cardiology, West Virginia UniversityMorgantown, WV, US
| | - Moinuddin Syed
- Department of Cardiology, Boston UniversityBoston, MA, US
| | - Mahboob Alam
- Department of Cardiology, Baylor College of MedicineHouston, TX, US
| | - Islam Y Elgendy
- Division of Cardiovascular Medicine, Gill Heart Institute, University of KentuckyLexington, KT, US
| | - Affan Haleem
- Department of Cardiology, West Virginia UniversityMorgantown, WV, US
| | - Akram Kawsara
- Department of Cardiology, West Virginia UniversityMorgantown, WV, US
| | - M Chadi Alraies
- Detroit Medical Centre, Wayne State UniversityDetroit, MI, US
| | - Ramesh Daggubati
- Department of Cardiology, West Virginia UniversityMorgantown, WV, US
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17
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Fernandes A, Oliveira A, Soares R, Barata P. The Effects of Ionizing Radiation on Gut Microbiota: What Can Animal Models Tell Us?-A Systematic Review. Curr Issues Mol Biol 2023; 45:3877-3910. [PMID: 37232718 DOI: 10.3390/cimb45050249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 04/16/2023] [Accepted: 04/27/2023] [Indexed: 05/27/2023] Open
Abstract
BACKGROUND The gut microbiota is relatively stable; however, various factors can precipitate an imbalance that is known to be associated with various diseases. We aimed to conduct a systematic literature review of studies reporting the effects of ionizing radiation on the composition, richness, and diversity of the gut microbiota of animals. METHODS A systematic literature search was performed in PubMed, EMBASE, and Cochrane library databases. The standard methodologies expected by Cochrane were utilized. RESULTS We identified 3531 non-duplicated records and selected twenty-nine studies after considering the defined inclusion criteria. The studies were found to be heterogeneous, with significant differences in the chosen populations, methodologies, and outcomes. Overall, we found evidence of an association between ionizing radiation exposure and dysbiosis, with a reduction of microbiota diversity and richness and alterations in the taxonomic composition. Although differences in taxonomic composition varied across studies, Proteobacteria, Verrucomicrobia, Alistipes, and Akkermancia most consistently reported to be relatively more abundant after ionizing radiation exposure, whereas Bacteroidetes, Firmicutes, and Lactobacillus were relatively reduced. CONCLUSIONS This review highlights the effect of ionizing exposure on gut microbiota diversity, richness, and composition. It paves the way for further studies on human subjects regarding gastrointestinal side effects in patients submitted to treatments with ionizing radiation and the development of potential preventive, therapeutic approaches.
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Affiliation(s)
- Ana Fernandes
- Department Nuclear Medicine, Centro Hospitalar e Universitário de São João, E.P.E., 4200-319 Porto, Portugal
| | - Ana Oliveira
- Department Nuclear Medicine, Centro Hospitalar e Universitário de São João, E.P.E., 4200-319 Porto, Portugal
| | - Raquel Soares
- i3S-Institute for Research and Innovation in Health, Universidade do Porto, 4200-135 Porto, Portugal
- Department of Biomedicine, Faculdade de Medicina, Universidade do Porto, 4200-319 Porto, Portugal
| | - Pedro Barata
- i3S-Institute for Research and Innovation in Health, Universidade do Porto, 4200-135 Porto, Portugal
- Faculdade de Ciências da Saúde, Universidade Fernando Pessoa, 4200-150 Porto, Portugal
- Department of Pathology, Centro Hospitalar Universitário do Porto, 4099-001 Porto, Portugal
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18
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Liu R, Gao L, Wang J, Ni T, Li Y, Wang R, Li D, Bu J, Zeng C, Li B, Luo J. Investigation of Anomalous Degradation Tendency of Low-Frequency Noise in Irradiated SOI-NMOSFETs. Micromachines (Basel) 2023; 14:602. [PMID: 36985009 PMCID: PMC10051952 DOI: 10.3390/mi14030602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 03/01/2023] [Accepted: 03/03/2023] [Indexed: 06/18/2023]
Abstract
In this work, we present new evidence of the physical mechanism behind the generation of low-frequency noise with high interface-trap density by measuring the low-frequency noise magnitudes of partially depleted (PD) silicon-on-insulator (SOI) NMOSFETs as a function of irradiation dose. We measure the DC electrical characteristics of the devices at different irradiation doses and separate the threshold-voltage shifts caused by the oxide-trap charge and interface-trap charge. Moreover, the increased densities of the oxide-trap charge projected to the Si/SiO2 interface and interface-trap charge are calculated. The results of our experiment suggest that the magnitudes of low-frequency noise do not necessarily increase with the increase in border-trap density. A novel physical explanation for the low-frequency noise in SOI-NMOSFETs with high interface-trap density is proposed. We reveal that the presence of high-density interface traps after irradiation has a repressing effect on the generation of low-frequency noise. Furthermore, the exchange of some carriers between border traps and interface traps can cause a decrease in the magnitude of low-frequency noise when the interface-trap density is high.
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Affiliation(s)
- Rui Liu
- Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences, Beijing 100029, China
| | - Linchun Gao
- Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China
- Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences, Beijing 100029, China
| | - Juanjuan Wang
- Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China
- Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences, Beijing 100029, China
| | - Tao Ni
- Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China
- Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences, Beijing 100029, China
| | - Yifan Li
- Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences, Beijing 100029, China
| | - Runjian Wang
- Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences, Beijing 100029, China
| | - Duoli Li
- Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China
- Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences, Beijing 100029, China
| | - Jianhui Bu
- Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China
- Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences, Beijing 100029, China
| | - Chuanbin Zeng
- Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China
- Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences, Beijing 100029, China
| | - Bo Li
- Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China
- Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences, Beijing 100029, China
| | - Jiajun Luo
- Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China
- Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences, Beijing 100029, China
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Chang SJ, Kim DS, Kim TW, Bae Y, Jung HW, Choi IG, Noh YS, Lee SH, Kim SI, Ahn HK, Kang DM, Lim JW. Mechanisms of the Device Property Alteration Generated by the Proton Irradiation in GaN-Based MIS-HEMTs Using Extremely Thin Gate Insulator. Nanomaterials (Basel) 2023; 13:898. [PMID: 36903774 PMCID: PMC10005350 DOI: 10.3390/nano13050898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 02/15/2023] [Accepted: 02/20/2023] [Indexed: 06/18/2023]
Abstract
Recently, we reported that device performance degradation mechanisms, which are generated by the γ-ray irradiation in GaN-based metal-insulator-semiconductor high electron mobility transistors (MIS-HEMTs), use extremely thin gate insulators. When the γ-ray was radiated, the total ionizing dose (TID) effects were generated and the device performance deteriorated. In this work, we investigated the device property alteration and its mechanisms, which were caused by the proton irradiation in GaN-based MIS-HEMTs for the 5 nm-thick Si3N4 and HfO2 gate insulator. The device property, such as threshold voltage, drain current, and transconductance varied by the proton irradiation. When the 5 nm-thick HfO2 layer was employed for the gate insulator, the threshold voltage shift was larger than that of the 5 nm-thick Si3N4 gate insulator, despite the HfO2 gate insulator exhibiting better radiation resistance compared to the Si3N4 gate insulator. On the other hand, the drain current and transconductance degradation were less for the 5 nm-thick HfO2 gate insulator. Unlike the γ-ray irradiation, our systematic research included pulse-mode stress measurements and carrier mobility extraction and revealed that the TID and displacement damage (DD) effects were simultaneously generated by the proton irradiation in GaN-based MIS-HEMTs. The degree of the device property alteration was determined by the competition or superposition of the TID and DD effects for the threshold voltage shift and drain current and transconductance deterioration, respectively. The device property alteration was diminished due to the reduction of the linear energy transfer with increasing irradiated proton energy. We also studied the frequency performance degradation that corresponded to the irradiated proton energy in GaN-based MIS-HEMTs using an extremely thin gate insulator.
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Affiliation(s)
- Sung-Jae Chang
- ICT Components & Material Research Laboratory, Photonic/Wireless Convergence Research Department, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea
| | - Dong-Seok Kim
- Korea Multi-Purpose Accelerator Complex, Korea Atomic Energy Research Institute, Gyungju 38180, Republic of Korea
| | - Tae-Woo Kim
- Department of Electrical/Electronic, University of Ulsan, Ulsan 44610, Republic of Korea
| | - Youngho Bae
- Department of IT Convergence, Uiduk University, Gyeongju 38004, Republic of Korea
| | - Hyun-Wook Jung
- ICT Components & Material Research Laboratory, Photonic/Wireless Convergence Research Department, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea
| | - Il-Gyu Choi
- ICT Components & Material Research Laboratory, Photonic/Wireless Convergence Research Department, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea
| | - Youn-Sub Noh
- ICT Components & Material Research Laboratory, Photonic/Wireless Convergence Research Department, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea
| | - Sang-Heung Lee
- ICT Components & Material Research Laboratory, Photonic/Wireless Convergence Research Department, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea
| | - Seong-Il Kim
- ICT Components & Material Research Laboratory, Photonic/Wireless Convergence Research Department, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea
| | - Ho-Kyun Ahn
- ICT Components & Material Research Laboratory, Photonic/Wireless Convergence Research Department, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea
| | - Dong-Min Kang
- ICT Components & Material Research Laboratory, Photonic/Wireless Convergence Research Department, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea
| | - Jong-Won Lim
- ICT Components & Material Research Laboratory, Photonic/Wireless Convergence Research Department, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea
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20
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Zaharescu T, Nicula N, Râpă M, Iordoc M, Tsakiris V, Marinescu VE. Structural Insights into LDPE/UHMWPE Blends Processed by γ-Irradiation. Polymers (Basel) 2023; 15:polym15030696. [PMID: 36771997 PMCID: PMC9920361 DOI: 10.3390/polym15030696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 01/19/2023] [Accepted: 01/26/2023] [Indexed: 01/31/2023] Open
Abstract
Ultra-high-molecular-weight polyethylene (UHMWPE) matrices containing low-density polyethylene (LDPE), hydroxyapatite (HAp) as filler, and rosemary extract (RM) as stabilizer were investigated for their qualification for long-term applications. The significant contributions of the blend components were analyzed, and variations in mechanical properties, oxidation strength, thermal behavior, crystallinity, and wettability were discussed. SEM images of microstructural peculiarities completed the introspective survey. The stability improvement due to the presence of both additives was an increase in the total degradation period of 67% in comparison with an unmodified HDPE/UHMWPE blend when the materials were subjected to a 50 kGy γ-dose. There was growth in activation energies from 121 kJ mol-1 to 139 kJ mol-1 when HAp and rosemary extract delayed oxidation. The exposure of samples to the action of γ-rays was found to be a proper procedure for accomplishing accelerated oxidative degradation. The presence of rosemary extract and HAp powder significantly increased the thermal and oxidation resistances. The calculation of material lifetimes at various temperatures provided meaningful information on the wearability and integrity of the inspected composites.
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Affiliation(s)
- Traian Zaharescu
- INCDIE ICPE CA, 3131 Splaiul Unirii, 030138 Bucharest, Romania
- Correspondence: (T.Z.); (N.N.)
| | - Nicoleta Nicula
- INCDIE ICPE CA, 3131 Splaiul Unirii, 030138 Bucharest, Romania
- Correspondence: (T.Z.); (N.N.)
| | - Maria Râpă
- Faculty of Materials Science and Engineering, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania
| | - Mihai Iordoc
- INCDIE ICPE CA, 3131 Splaiul Unirii, 030138 Bucharest, Romania
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Ramos-Méndez J, Park C, Sharma M. Dosimetric characterization of single- and dual-port temporary tissue expanders for postmastectomy radiotherapy using Monte Carlo methods. Front Oncol 2023; 13:1124838. [PMID: 37143943 PMCID: PMC10151677 DOI: 10.3389/fonc.2023.1124838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 03/31/2023] [Indexed: 05/06/2023] Open
Abstract
Purpose The aim of this work was two-fold: a) to assess two treatment planning strategies for accounting CT artifacts introduced by temporary tissue-expanders (TTEs); b) to evaluate the dosimetric impact of two commercially available and one novel TTE. Methods The CT artifacts were managed using two strategies. 1) Identifying the metal in the RayStation treatment planning software (TPS) using image window-level adjustments, delineate a contour enclosing the artifact, and setting the density of the surrounding voxels to unity (RS1). 2) Registering a geometry template with dimensions and materials from the TTEs (RS2). Both strategies were compared for DermaSpan, AlloX2, and AlloX2-Pro TTEs using Collapsed Cone Convolution (CCC) in RayStation TPS, Monte Carlo simulations (MC) using TOPAS, and film measurements. Wax slab phantoms with metallic ports and breast phantoms with TTEs balloons were made and irradiated with a 6 MV AP beam and partial arc, respectively. Dose values along the AP direction calculated with CCC (RS2) and TOPAS (RS1 and RS2) were compared with film measurements. The impact in dose distributions was evaluated with RS2 by comparing TOPAS simulations with and without the metal port. Results For the wax slab phantoms, the dose differences between RS1 and RS2 were 0.5% for DermaSpan and AlloX2 but 3% for AlloX2-Pro. From TOPAS simulations of RS2, the impact in dose distributions caused by the magnet attenuation was (6.4 ± 0.4) %, (4.9 ± 0.7)%, and (2.0 ± 0.9)% for DermaSpan, AlloX2, and AlloX2-Pro, respectively. With breast phantoms, maximum differences in DVH parameters between RS1 and RS2 were as follows. For AlloX2 at the posterior region: (2.1 ± 1.0)%, (1.9 ± 1.0)% and (1.4 ± 1.0)% for D1, D10, and average dose, respectively. For AlloX2-Pro at the anterior region (-1.0 ± 1.0)%, (-0.6 ± 1.0)% and (-0.6 ± 1.0)% for D1, D10 and average dose, respectively. The impact in D10 caused by the magnet was at most (5.5 ± 1.0)% and (-0.8 ± 1.0)% for AlloX2 and AlloX2-Pro, respectively. Conclusion Two strategies for accounting for CT artifacts from three breast TTEs were assessed using CCC, MC, and film measurements. This study showed that the highest differences with respect to measurements occurred with RS1 and can be mitigated if a template with the actual port geometry and materials is used.
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Herbach E, O'Rorke MA, Carnahan RM, McDowell BD, Allen B, Grumbach I, London B, Smith BJ, Spitz DR, Seaman A, Chrischilles EA. Cardiac Adverse Events Associated With Chemo-Radiation Versus Chemotherapy for Resectable Stage III Non-Small-Cell Lung Cancer: A Surveillance, Epidemiology and End Results-Medicare Study. J Am Heart Assoc 2022; 11:e027288. [PMID: 36453633 PMCID: PMC9851429 DOI: 10.1161/jaha.122.027288] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
Background We compared cardiac outcomes for surgery-eligible patients with stage III non-small-cell lung cancer treated adjuvantly or neoadjuvantly with chemotherapy versus chemo-radiation therapy in the Surveillance, Epidemiology and End Results-Medicare database. Methods and Results Patients were age 66+, had stage IIIA/B resectable non-small-cell lung cancer diagnosed between 2007 and 2015, and received adjuvant or neoadjuvant chemotherapy or chemo-radiation within 121 days of diagnosis. Patients having chemo-radiation and chemotherapy only were propensity-score matched and followed from day 121 to first cardiac outcome, noncardiac death, radiation initiation by patients who received chemotherapy only, fee-for-service enrollment interruption, or December 31, 2016. Cause-specific hazard ratios (HRs) and competing risks subdistribution HRs were estimated. The primary outcome was the first of these severe cardiac events: acute myocardial infarction, other hospitalized ischemic heart disease, hospitalized heart failure, percutaneous coronary intervention/coronary artery bypass graft, cardiac death, or urgent/inpatient care for pericardial disease, conduction abnormality, valve disorder, or ischemic heart disease. With median follow-up of 13 months, 70 of 682 patients who received chemo-radiation (10.26%) and 43 of 682 matched patients who received chemotherapy only (6.30%) developed a severe cardiac event (P=0.008) with median time to first event 5.45 months. Chemo-radiation increased the rate of severe cardiac events (cause-specific HR: 1.62 [95% CI, 1.11-2.37] and subdistribution HR: 1.41 [95% CI, 0.97-2.04]). Cancer severity appeared greater among patients who received chemo-radiation (noncardiac death cause-specific HR, 2.53 [95% CI, 1.93-3.33] and subdistribution HR, 2.52 [95% CI, 1.90-3.33]). Conclusions Adding radiation therapy to chemotherapy is associated with an increased risk of severe cardiac events among patients with resectable stage III non-small-cell lung cancer for whom survival benefit of radiation therapy is unclear.
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Affiliation(s)
- Emma Herbach
- Department of Epidemiology, College of Public HealthUniversity of IowaIowa CityIA
| | - Michael A. O'Rorke
- Department of Epidemiology, College of Public HealthUniversity of IowaIowa CityIA
- Holden Comprehensive Cancer CenterUniversity of IowaIowa CityIA
| | - Ryan M. Carnahan
- Department of Epidemiology, College of Public HealthUniversity of IowaIowa CityIA
| | | | - Bryan Allen
- Holden Comprehensive Cancer CenterUniversity of IowaIowa CityIA
- Department of Radiation Oncology, Carver College of MedicineUniversity of IowaIowa CityIA
| | - Isabella Grumbach
- Division of Cardiovascular Medicine, Department of Internal Medicine and Abboud Cardiovascular Research CenterUniversity of IowaIowa CityIA
- Department of Internal Medicine, Carver College of MedicineUniversity of IowaIowa CityIA
| | - Barry London
- Division of Cardiovascular Medicine, Department of Internal Medicine and Abboud Cardiovascular Research CenterUniversity of IowaIowa CityIA
- Department of Internal Medicine, Carver College of MedicineUniversity of IowaIowa CityIA
| | - Brian J. Smith
- Holden Comprehensive Cancer CenterUniversity of IowaIowa CityIA
- Department of Biostatistics, College of Public HealthUniversity of IowaIowa CityIA
| | - Douglas R. Spitz
- Holden Comprehensive Cancer CenterUniversity of IowaIowa CityIA
- Department of Radiation Oncology, Carver College of MedicineUniversity of IowaIowa CityIA
| | - Aaron Seaman
- Holden Comprehensive Cancer CenterUniversity of IowaIowa CityIA
- Department of Internal Medicine, Carver College of MedicineUniversity of IowaIowa CityIA
| | - Elizabeth A. Chrischilles
- Department of Epidemiology, College of Public HealthUniversity of IowaIowa CityIA
- Holden Comprehensive Cancer CenterUniversity of IowaIowa CityIA
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Bazyka DA, Sushko VO, Chumak AA, Fedirko PA, Talko VV, Yanovych LA, Yanovych L. STATE INSTITUTION «NATIONAL RESEARCH CENTER FOR RADIATION MEDICINE OF THE NATIONAL ACADEMY OF MEDICAL SCIENCES OF UKRAINE» - RESEARCH ACTIVITIES AND SCIENTIFIC ADVANCE IN 2021. Probl Radiac Med Radiobiol 2022; 27:10-24. [PMID: 36582079 DOI: 10.33145/2304-8336-2022-27-10-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Indexed: 12/28/2022]
Abstract
Research activities and scientific advance achieved in 2021 at the State Institution «National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine» (NRCRM) concerning medical problems of the Chornobyl disaster, radiation medicine, radiobiology, radiation hygiene and epidemiology in collaboration with the WHO network of medical preparedness and assistance in radiation accidents are outlined in the annual report. The report presents the results of fundamental and applied research works of the study of radiation effectsand health effects of the Chornobyl accident.The report also shows the results of scientific-organizational and health care work, staff training. The Scientific Council meeting of NAMS approved the NRCRM Annual Report.
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Affiliation(s)
- D A Bazyka
- State Institution National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine, 53 Yuriia Illienka St., Kyiv, 04050, Ukraine
| | - V O Sushko
- State Institution National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine, 53 Yuriia Illienka St., Kyiv, 04050, Ukraine
| | - A A Chumak
- State Institution National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine, 53 Yuriia Illienka St., Kyiv, 04050, Ukraine
| | - P A Fedirko
- State Institution National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine, 53 Yuriia Illienka St., Kyiv, 04050, Ukraine
| | - V V Talko
- State Institution National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine, 53 Yuriia Illienka St., Kyiv, 04050, Ukraine
| | - L A Yanovych
- State Institution National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine, 53 Yuriia Illienka St., Kyiv, 04050, Ukraine
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Alcaraz M, Olivares A, Andreu-Gálvez M, Achel DG, Mercado AM, Alcaraz-Saura M. Paradoxical Radiosensitizing Effect of Carnosic Acid on B16F10 Metastatic Melanoma Cells: A New Treatment Strategy. Antioxidants (Basel) 2022; 11. [PMID: 36358539 DOI: 10.3390/antiox11112166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 10/27/2022] [Accepted: 10/28/2022] [Indexed: 11/06/2022] Open
Abstract
Carnosic acid (CA) is a phenolic diterpene characterized by its high antioxidant activity; it is used in industrial, cosmetic, and nutritional applications. We evaluated the radioprotective capacity of CA on cells directly exposed to X-rays and non-irradiated cells that received signals from X-ray treated cells (radiation induced bystander effect, RIBE). The genoprotective capacity was studied by in vivo and in vitro micronucleus assays. Radioprotective capacity was evaluated by clonogenic cell survival, MTT, apoptosis and intracellular glutathione assays comparing radiosensitive cells (human prostate epithelium, PNT2) with radioresistant cells (murine metastatic melanoma, B16F10). CA was found to exhibit a genoprotective capacity in cells exposed to radiation (p < 0.001) and in RIBE (p < 0.01). In PNT2 cells, considered as normal cells in our study, CA achieved 97% cell survival after exposure to 20 Gy of X-rays, eliminating 67% of radiation-induced cell death (p < 0.001), decreasing apoptosis (p < 0.001), and increasing the GSH/GSSH ratio (p < 0.01). However, the administration of CA to B16F10 cells decreased cell survival by 32%, increased cell death by 200% (p < 0.001) compared to irradiated cells, and increased cell death by 100% (p < 0.001) in RIBE bystander cells (p < 0.01). Furthermore, it increased apoptosis (p < 0.001) and decreased the GSH/GSSG ratio (p < 0.01), expressing a paradoxical radiosensitizing effect in these cells. Knowing the potential mechanisms of action of substances such as CA could help to create new applications that would protect healthy cells and exclusively damage neoplastic cells, thus presenting a new desirable strategy for cancer patients in need of radiotherapy.
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Morana A, Marin E, Lablonde L, Blanchet T, Robin T, Cheymol G, Laffont G, Boukenter A, Ouerdane Y, Girard S. Radiation Effects on Fiber Bragg Gratings: Vulnerability and Hardening Studies. Sensors (Basel) 2022; 22:8175. [PMID: 36365872 PMCID: PMC9656723 DOI: 10.3390/s22218175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 10/19/2022] [Accepted: 10/20/2022] [Indexed: 06/16/2023]
Abstract
Fiber Bragg gratings (FBGs) are point optical fiber sensors that allow the monitoring of a diversity of environmental parameters, e.g., temperature or strain. Several research groups have studied radiation effects on the grating response, as they are implemented in harsh environments: high energy physics, space, and nuclear facilities. We report here the advances made to date in studies regarding the vulnerability and hardening of this sensor under radiation. First, we introduce its principle of operation. Second, the different grating inscription techniques are briefly illustrated as well as the differences among the various types. Then, we focus on the radiation effects induced on different FBGs. Radiation induces a shift in their Bragg wavelengths, which is a property serving to measure environmental parameters. This radiation-induced Bragg wavelength shift (RI-BWS) leads to a measurement error, whose amplitude and kinetics depend on many parameters: inscription conditions, fiber type, pre- or post-treatments, and irradiation conditions (nature, dose, dose rate, and temperature). Indeed, the radiation hardness of an FBG is not directly related to that of the fiber where it has been photo-inscribed by a laser. We review the influence of all these parameters and discuss how it is possible to manufacture FBGs with limited RI-BWS, opening the way to their implementation in radiation-rich environments.
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Affiliation(s)
- Adriana Morana
- UJM, CNRS, IOGS, Laboratoire Hubert Curien, University of Lyon, UMR 5516, 18 rue Prof. B. Lauras, F-42000 Saint-Etienne, France
| | - Emmanuel Marin
- UJM, CNRS, IOGS, Laboratoire Hubert Curien, University of Lyon, UMR 5516, 18 rue Prof. B. Lauras, F-42000 Saint-Etienne, France
| | | | - Thomas Blanchet
- CEA List, Université Paris-Saclay, F-91120 Palaiseau, France
| | | | - Guy Cheymol
- CEA, Service d’Études Analytiques et de Réactivité des Surfaces, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | | | - Aziz Boukenter
- UJM, CNRS, IOGS, Laboratoire Hubert Curien, University of Lyon, UMR 5516, 18 rue Prof. B. Lauras, F-42000 Saint-Etienne, France
| | - Youcef Ouerdane
- UJM, CNRS, IOGS, Laboratoire Hubert Curien, University of Lyon, UMR 5516, 18 rue Prof. B. Lauras, F-42000 Saint-Etienne, France
| | - Sylvain Girard
- UJM, CNRS, IOGS, Laboratoire Hubert Curien, University of Lyon, UMR 5516, 18 rue Prof. B. Lauras, F-42000 Saint-Etienne, France
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Shah R, Elangovan A, Jordan DW, Katz J, Cooper GS. 10-Year Trend of Abdominal Magnetic Resonance Imaging Compared With Abdominal Computed Tomography Scans in Inflammatory Bowel Disease. Inflamm Bowel Dis 2022; 28:1357-1362. [PMID: 34935946 DOI: 10.1093/ibd/izab284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Indexed: 12/09/2022]
Abstract
BACKGROUND Patients with inflammatory bowel disease (IBD) frequently undergo multiple computed tomography (CT) examinations. With the widespread availability of magnetic resonance imaging (MRI), it is unclear whether the use of CTs in IBD has declined. We aimed to analyze the trends of CT and MRI use in a large cohort of IBD patients in a 10-year period. METHODS We retrospectively analyzed adults ≥18 years of age using a de-identified database, IBM Explorys. Patients with ≥1 CT of the abdomen (± pelvis) or MRI of the abdomen (± pelvis) at least 30 days after the diagnosis of Crohn's disease (CD) or ulcerative colitis (UC) were included. We examined the factors associated with patients undergoing multiple CTs (≥5 CTs of the abdomen) and performed a trend analysis from 2010 to 2019. RESULTS Among 176 110 CD and 143 460 UC patients, those with ≥1 CT of the abdomen annually increased from 2010 to 2019 with mean annual percentage change of +3.6% for CD and +4.9% for UC. Similarly, annual percentage change for patients with ≥1 MRI (CD: +15.6%; UC: +22.8%) showed a rising trend. There was a 3.8% increase in CD patients receiving ≥5 CTs of the abdomen annually compared with a 2.4% increase among UC patients in the 10-year period. Age ≥50 years, men, African Americans, public insurance payors, body mass index ≥30kg/m2, and smoking history were associated with ≥5 CTs. CONCLUSIONS There is a considerable increase in the number of CT scans performed in IBD patients. Further studies can explore factors influencing the use of CT and MRI of the abdomen in IBD patients.
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Affiliation(s)
- Raj Shah
- Division of Gastroenterology, Case Western Reserve University/University Hospitals Cleveland Medical Center, Cleveland, OH, USA.,Division of Gastroenterology, Hepatology and Endoscopy, Brigham and Women's Hospital, Boston, MA, USA
| | - Abbinaya Elangovan
- Division of Gastroenterology, Case Western Reserve University/University Hospitals Cleveland Medical Center, Cleveland, OH, USA
| | - David W Jordan
- Department of Radiology, Case Western Reserve University/University Hospitals Cleveland Medical Center, Cleveland, OH, USA
| | - Jeffry Katz
- Division of Gastroenterology, Case Western Reserve University/University Hospitals Cleveland Medical Center, Cleveland, OH, USA
| | - Gregory S Cooper
- Division of Gastroenterology, Case Western Reserve University/University Hospitals Cleveland Medical Center, Cleveland, OH, USA
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27
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Rake C, Gilham C, Scholze M, Bukasa L, Stephens J, Simpson J, Peto J, Anderson R. British nuclear test veteran family trios for the study of genetic risk. J Radiol Prot 2022; 42:021528. [PMID: 35726547 DOI: 10.1088/1361-6498/ac6e10] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Accepted: 05/09/2022] [Indexed: 06/15/2023]
Abstract
The risk of radiation effects in children of individuals exposed to ionising radiation remains an ongoing concern for aged veterans of the British nuclear testing programme. The genetic and cytogenetic family trio (GCFT) study is the first study to obtain blood samples from a group of British nuclear test veterans and their families for the purposes of identifying genetic alterations in offspring as a consequence of historical paternal exposure to ionising radiation. In this report, we describe the processes for recruitment and sampling, and provide a general description of the study population recruited. In total, blood samples were received from 91 (49 test and 42 control) families representing veteran servicemen from the army, Royal Air Force and Royal Navy. This translated to an overall response rate of 14% (49/353) for test veterans and 4% (42/992) for control veterans (excluding responders known to be ineligible). Due to the lack of dose information available, test veterans were allocated to a three-point exposure rank. Thirty (61%) test veterans were ranked in the lower group. Nineteen (39%) of the 49 test veterans were classified in the mid (5 veterans; 10%)/high (14 veterans; 29%) exposure ranks and included 12 veterans previously identified as belonging to the special groups or listed in health physics documents. An increased number of test veteran families (20%), compared with control families (5%), self-reported offspring with congenital abnormalities (p= 0.03). Whether this observation in this small group is reflective of the entire UK test veteran cohort or whether it is selection bias requires further work. The cohort described here represent an important and unique family trio grouping whose participation is enabling genetic studies, as part of the GCFT study, to be carried out. The outcomes of these studies will be published elsewhere. ISRCTN Registry: 17461668.
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Affiliation(s)
- Christine Rake
- Department of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, United Kingdom
| | - Clare Gilham
- Department of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, United Kingdom
| | - Martin Scholze
- Centre for Health Effects of Radiological and Chemical Agents, Department of Life Sciences, College of Health, Medicine and Life Sciences, Brunel University London, Uxbridge UB8 3PH, United Kingdom
| | - Laurette Bukasa
- Department of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, United Kingdom
| | - Jade Stephens
- Centre for Health Effects of Radiological and Chemical Agents, Department of Life Sciences, College of Health, Medicine and Life Sciences, Brunel University London, Uxbridge UB8 3PH, United Kingdom
| | - Jayne Simpson
- Department of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, United Kingdom
| | - Julian Peto
- Department of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, United Kingdom
| | - Rhona Anderson
- Centre for Health Effects of Radiological and Chemical Agents, Department of Life Sciences, College of Health, Medicine and Life Sciences, Brunel University London, Uxbridge UB8 3PH, United Kingdom
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28
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Gigax JG, Chancey MR, Xie D, Kim H, Wang Y, Maloy SA, Li N. A Novel Microshear Geometry for Exploring the Influence of Void Swelling on the Mechanical Properties Induced by MeV Heavy Ion Irradiation. Materials (Basel) 2022; 15:ma15124253. [PMID: 35744308 PMCID: PMC9231319 DOI: 10.3390/ma15124253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 05/18/2022] [Accepted: 06/01/2022] [Indexed: 02/05/2023]
Abstract
Small disks are often the specimen of choice for exposure in nuclear reactor environments, and this geometry invariably limits the types of mechanical testing that can be performed on the specimen. Recently, shear punch testing has been utilized to evaluate changes arising from neutron irradiation in test reactor environments on these small disk specimens. As part of a broader effort to link accelerated testing using ion irradiation and conventional neutron irradiation techniques, a novel microshear specimen geometry was developed for use with heavy-ion irradiated specimens. The technique was demonstrated in pure Cu irradiated to 11 and 110 peak dpa with 10 MeV Cu ions. At 11 peak dpa, the Cu specimen had a high density of small voids in the irradiated region, while at 110 peak dpa, larger voids with an average void swelling of ~20% were observed. Micropillar and microshear specimens both exhibited hardening at 11 dpa, followed by softening at 110 dpa. The close alignment of the new microshear technique and more conventional micropillar testing, and the fact that both follow intuition, is a good first step towards applying microshear testing to a wider range of irradiated materials.
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Affiliation(s)
- Jonathan G. Gigax
- Operational Readiness and Implementation, Los Alamos National Lab, Los Alamos, NM 87545, USA
- Center for Integrated Nanotechnologies, Los Alamos National Lab, Los Alamos, NM 87545, USA; (D.X.); (Y.W.); (N.L.)
- Correspondence:
| | - Matthew R. Chancey
- Materials Science at Radiation and Dynamics Extremes, Los Alamos National Lab, Los Alamos, NM 87545, USA; (M.R.C.); (H.K.); (S.A.M.)
| | - Dongyue Xie
- Center for Integrated Nanotechnologies, Los Alamos National Lab, Los Alamos, NM 87545, USA; (D.X.); (Y.W.); (N.L.)
| | - Hyosim Kim
- Materials Science at Radiation and Dynamics Extremes, Los Alamos National Lab, Los Alamos, NM 87545, USA; (M.R.C.); (H.K.); (S.A.M.)
| | - Yongqiang Wang
- Center for Integrated Nanotechnologies, Los Alamos National Lab, Los Alamos, NM 87545, USA; (D.X.); (Y.W.); (N.L.)
- Materials Science at Radiation and Dynamics Extremes, Los Alamos National Lab, Los Alamos, NM 87545, USA; (M.R.C.); (H.K.); (S.A.M.)
| | - Stuart A. Maloy
- Materials Science at Radiation and Dynamics Extremes, Los Alamos National Lab, Los Alamos, NM 87545, USA; (M.R.C.); (H.K.); (S.A.M.)
- Reactor Materials and Mechanical Design, Pacific Northwest National Lab, Richland, WA 99354, USA
| | - Nan Li
- Center for Integrated Nanotechnologies, Los Alamos National Lab, Los Alamos, NM 87545, USA; (D.X.); (Y.W.); (N.L.)
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Watts PC, Mappes T, Tukalenko E, Mousseau TA, Boratyński Z, Møller AP, Lavrinienko A. Interpretation of gut microbiota data in the 'eye of the beholder': A commentary and re-evaluation of data from 'Impacts of radiation exposure on the bacterial and fungal microbiome of small mammals in the Chernobyl Exclusion Zone'. J Anim Ecol 2022; 91:1535-1545. [PMID: 35694772 PMCID: PMC9541917 DOI: 10.1111/1365-2656.13667] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 01/05/2022] [Indexed: 12/13/2022]
Abstract
Evidence that exposure to environmental pollutants can alter the gut microbiota composition of wildlife includes studies of rodents exposed to radionuclides. Antwis et al. (2021) used amplicon sequencing to characterise the gut microbiota of four species of rodent (Myodes glareolus, Apodemus agrarius, A. flavicollis and A. sylvaticus) inhabiting the Chernobyl Exclusion Zone (CEZ) to examine possible changes in gut bacteria (microbiota) and gut fungi (mycobiota) associated with exposure to radionuclides and whether the sample type (from caecum or faeces) affected the analysis. The conclusions derived from the analyses of gut mycobiota are based on data that represent a mixture of ingested fungi (e.g. edible macrofungi, polypores, lichens and ectomycorrhizae) and gut mycobiota (e.g. microfungi and yeasts), which mask the patterns of inter‐ and intraspecific variation in the authentic gut mycobiota. Implying that ‘faecal samples are not an accurate indicator of gut composition’ creates an unnecessary controversy about faecal sampling because the comparison of samples from the caecum and faeces confounds many other possible drivers (including different animals from different locations, sampled in different years) of variation in gut microbiota. It is relevant also that Antwis et al.'s (2021) data lack statistical power to detect an effect of exposure to radionuclides on the gut microbiota because (1) all of their samples of Apodemus mice had experienced a medium or high total absorbed dose rate and (2) they did not collect samples of bank voles (M. glareolus) from replicate contaminated and uncontaminated locations. Discussion of Antwis et al.'s (2021) analysis, especially the claims presented in the Abstract, is important to prevent controversy about the outcome of research on the biological impacts of wildlife inhabiting the CEZ.
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Affiliation(s)
- Phillip C Watts
- Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland
| | - Tapio Mappes
- Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland
| | - Eugene Tukalenko
- Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland.,National Research Center for Radiation Medicine of the National Academy of Medical Science, Kyiv, Ukraine
| | - Timothy A Mousseau
- Department of Biological Sciences, University of South Carolina, Columbia, South Carolina, USA
| | - Zbyszek Boratyński
- CIBIO/InBio, Research Centre in Biodiversity and Genetic Resources, University of Porto, Vairão, Portugal
| | - Anders P Møller
- Laboratoire d'Ecologie, Systématique et Evolution, CNRS UMR 8079, Université Paris-Sud 11, Orsay Cedex, France
| | - Anton Lavrinienko
- Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland
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30
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Nathaniel JE, El-Atwani O, Huang S, Marian J, Leff AC, Baldwin JK, Hattar K, Taheri ML. Implications of Microstructure in Helium-Implanted Nanocrystalline Metals. Materials (Basel) 2022; 15:ma15124092. [PMID: 35744151 PMCID: PMC9231260 DOI: 10.3390/ma15124092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 05/31/2022] [Accepted: 06/06/2022] [Indexed: 12/04/2022]
Abstract
Helium bubbles are known to form in nuclear reactor structural components when displacement damage occurs in conjunction with helium exposure and/or transmutation. If left unchecked, bubble production can cause swelling, blistering, and embrittlement, all of which substantially degrade materials and—moreover—diminish mechanical properties. On the mission to produce more robust materials, nanocrystalline (NC) metals show great potential and are postulated to exhibit superior radiation resistance due to their high defect and particle sink densities; however, much is still unknown about the mechanisms of defect evolution in these systems under extreme conditions. Here, the performances of NC nickel (Ni) and iron (Fe) are investigated under helium bombardment via transmission electron microscopy (TEM). Bubble density statistics are measured as a function of grain size in specimens implanted under similar conditions. While the overall trends revealed an increase in bubble density up to saturation in both samples, bubble density in Fe was over 300% greater than in Ni. To interrogate the kinetics of helium diffusion and trapping, a rate theory model is developed that substantiates that helium is more readily captured within grains in helium-vacancy complexes in NC Fe, whereas helium is more prone to traversing the grain matrices and migrating to GBs in NC Ni. Our results suggest that (1) grain boundaries can affect bubble swelling in grain matrices significantly and can have a dominant effect over crystal structure, and (2) an NC-Ni-based material can yield superior resistance to irradiation-induced bubble growth compared to an NC-Fe-based material and exhibits high potential for use in extreme environments where swelling due to He bubble formation is of significant concern.
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Affiliation(s)
- James E. Nathaniel
- Department of Materials Science & Engineering, Drexel University, Philadelphia, PA 19104, USA; (J.E.N.II); (O.E.-A.); (A.C.L.)
- Department of Materials Science & Engineering, Johns Hopkins, Baltimore, MD 21218, USA
| | - Osman El-Atwani
- Department of Materials Science & Engineering, Drexel University, Philadelphia, PA 19104, USA; (J.E.N.II); (O.E.-A.); (A.C.L.)
- Materials Science and Technology, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Shu Huang
- Department of Materials Science & Engineering, University of California Los Angeles, Los Angeles, CA 90095, USA; (S.H.); (J.M.)
| | - Jaime Marian
- Department of Materials Science & Engineering, University of California Los Angeles, Los Angeles, CA 90095, USA; (S.H.); (J.M.)
| | - Asher C. Leff
- Department of Materials Science & Engineering, Drexel University, Philadelphia, PA 19104, USA; (J.E.N.II); (O.E.-A.); (A.C.L.)
- Army Research Laboratory, Adelphi, MD 20783, USA
| | - Jon K. Baldwin
- Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;
| | - Khalid Hattar
- Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, NM 87185, USA;
| | - Mitra L. Taheri
- Department of Materials Science & Engineering, Drexel University, Philadelphia, PA 19104, USA; (J.E.N.II); (O.E.-A.); (A.C.L.)
- Department of Materials Science & Engineering, Johns Hopkins, Baltimore, MD 21218, USA
- Correspondence:
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Vives I Batlle J, Biermans G, Copplestone D, Kryshev A, Melintescu A, Mothersill C, Sazykina T, Seymour C, Smith K, Wood MD. Towards an ecological modelling approach for assessing ionizing radiation impact on wildlife populations. J Radiol Prot 2022; 42:020507. [PMID: 35467551 DOI: 10.1088/1361-6498/ac5dd0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Accepted: 03/15/2022] [Indexed: 06/14/2023]
Abstract
The emphasis of the international system of radiological protection of the environment is to protect populations of flora and fauna. Throughout the MODARIA programmes, the United Nations' International Atomic Energy Agency (IAEA) has facilitated knowledge sharing, data gathering and model development on the effect of radiation on wildlife. We present a summary of the achievements of MODARIA I and II on wildlife dose effect modelling, extending to a new sensitivity analysis and model development to incorporate other stressors. We reviewed evidence on historical doses and transgenerational effects on wildlife from radioactively contaminated areas. We also evaluated chemical population modelling approaches, discussing similarities and differences between chemical and radiological impact assessment in wildlife. We developed population modelling methodologies by sourcing life history and radiosensitivity data and evaluating the available models, leading to the formulation of an ecosystem-based mathematical approach. This resulted in an ecologically relevant conceptual population model, which we used to produce advice on the evaluation of risk criteria used in the radiological protection of the environment and a proposed modelling extension for chemicals. This work seeks to inform stakeholder dialogue on factors influencing wildlife population responses to radiation, including discussions on the ecological relevance of current environmental protection criteria. The area of assessment of radiation effects in wildlife is still developing with underlying data and models continuing to be improved. IAEA's ongoing support to facilitate the sharing of new knowledge, models and approaches to Member States is highlighted, and we give suggestions for future developments in this regard.
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Affiliation(s)
- J Vives I Batlle
- Belgian Nuclear Research Centre (SCK CEN), Boeretang 200, Mol, 2400, Belgium
| | - G Biermans
- Federal Agency for Nuclear Control, Rue Ravensteinstraat 36, Brussels, 1000, Belgium
| | - D Copplestone
- Faculty of Natural Sciences, University of Stirling, Stirling FK9 4LA, United Kingdom
| | - A Kryshev
- Research and Production Association 'Typhoon', 4 Pobedy Str., Obninsk, Kaluga Region 249038, Russia
| | - A Melintescu
- Horia Hulubei National Institute of Physics & Nuclear Engineering, Bucharest - Magurele, Romania
| | - C Mothersill
- Department of Biology, McMaster University, Hamilton, Ontario, Canada
| | - T Sazykina
- Research and Production Association 'Typhoon', 4 Pobedy Str., Obninsk, Kaluga Region 249038, Russia
| | - C Seymour
- Department of Biology, McMaster University, Hamilton, Ontario, Canada
| | - K Smith
- RadEcol Consulting Ltd, 5 The Chambers, Vineyard, Abingdon OX14 3PX, United Kingdom
| | - M D Wood
- School of Science, Engineering & Environment, University of Salford, Manchester M5 4WT, United Kingdom
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Vidalot J, Campanella C, Dachicourt J, Marcandella C, Duhamel O, Morana A, Poujols D, Assaillit G, Gaillardin M, Boukenter A, Ouerdane Y, Girard S, Paillet P. Monitoring of Ultra-High Dose Rate Pulsed X-ray Facilities with Radioluminescent Nitrogen-Doped Optical Fiber. Sensors (Basel) 2022; 22:3192. [PMID: 35590883 DOI: 10.3390/s22093192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Revised: 04/08/2022] [Accepted: 04/19/2022] [Indexed: 11/27/2022]
Abstract
We exploited the potential of radiation-induced emissions (RIEs) in the visible domain of a nitrogen-doped, silica-based, multimode optical fiber to monitor the very high dose rates associated with experiments at different pulsed X-ray facilities. We also tested this sensor at lower dose rates associated with steady-state X-ray irradiation machines (up to 100 keV photon energy, mean energy of 40 keV). For transient exposures, dedicated experimental campaigns were performed at ELSA (Electron et Laser, Source X et Applications) and ASTERIX facilities from CEA (Commissariat à l’Energie Atomique—France) to characterize the RIE of this fiber when exposed to X-ray pulses with durations of a few µs or ns. These facilities provide very large dose rates: in the order of MGy(SiO2)/s for the ELSA facility (up to 19 MeV photon energy) and GGy(SiO2)/s for the ASTERIX facility (up to 1 MeV). In both cases, the RIE intensities, mostly explained by the fiber radioluminescence (RIL) around 550 nm, with a contribution from Cerenkov at higher fluxes, linearly depend on the dose rates normalized to the pulse duration delivered by the facilities. By comparing these high dose rate results and those acquired under low-dose rate steady-state X-rays (only RIL was present), we showed that the RIE of this multimode optical fiber linearly depends on the dose rate over an ultra-wide dose rate range from 10−2 Gy(SiO2)/s to a few 109 Gy(SiO2)/s and photons with energy in the range from 40 keV to 19 MeV. These results demonstrate the high potential of this class of radiation monitors for beam monitoring at very high dose rates in a very large variety of facilities as future FLASH therapy facilities.
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Yeung P, Pinson JA, Lawson M, Leong C, Badawy MK. COVID-19 pandemic and the effect of increased utilisation of mobile X-ray examinations on radiation dose to radiographers. J Med Radiat Sci 2022; 69:147-155. [PMID: 35180810 PMCID: PMC9088417 DOI: 10.1002/jmrs.570] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 01/10/2022] [Accepted: 01/18/2022] [Indexed: 12/13/2022] Open
Abstract
Introduction The use of ionising radiation results in occupational exposure to medical imaging professionals, requiring routine monitoring. This study aims to assess the effect of increased utilisation of mobile X‐ray units, mobile imaging of non‐routine body regions and radiographer work practice changes for impact on staff radiation dose during the early stages of the COVID‐19 pandemic. Methods A retrospective analysis of general radiology departments across two metropolitan hospitals was performed. Personal radiation monitor exposure reports between January 2019 and December 2020 were analysed. Statistical analysis was conducted using a Mann–Whitney U test when comparing each quarter, from 2019 to 2020. Categorical data were compared using a Chi‐squared test. Results Mobile X‐ray use during the pandemic increased approximately 1.7‐fold, with the peak usage observed in September 2020. The mobile imaging rate per month of non‐routine body regions increased from approximately 6.0–7.8%. Reported doses marginally increased during Q2, Q3 and Q4 of 2020 (in comparison to 2019 data), though was not statistically significant (Q2: P = 0.13; Q3: P = 0.31 and Q4 P = 0.32). In Q1, doses marginally decreased and were not statistically significant (P = 0.22). Conclusion Increased utilisation and work practice changes had no significant effect on reported staff radiation dose. The average reported dose remained significantly lower than the occupational dose limits for radiation workers of 20 mSv.
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Affiliation(s)
- Phoebe Yeung
- Monash Health Imaging, Monash Health, Clayton, Victoria, Australia
| | - Jo-Anne Pinson
- Monash Health Imaging, Monash Health, Clayton, Victoria, Australia.,Department of Medical Imaging, Peninsula Health, Frankston, Victoria, Australia.,Department of Medical Imaging and Radiation Sciences, School of Allied Health Care, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia
| | - Michael Lawson
- Monash Health Imaging, Monash Health, Clayton, Victoria, Australia.,Faculty of Engineering, Centre of Medical and Radiation Physics, School of Physics, University of Wollongong, Keiraville, New South Wales, Australia
| | | | - Mohamed Khaldoun Badawy
- Monash Health Imaging, Monash Health, Clayton, Victoria, Australia.,Department of Medical Imaging and Radiation Sciences, School of Allied Health Care, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia
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López A, Varela S, Medina E. Radiation modulated spin coupling in a double-stranded DNA model. J Phys Condens Matter 2022; 34:135301. [PMID: 34991081 DOI: 10.1088/1361-648x/ac48c1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2021] [Accepted: 01/06/2022] [Indexed: 06/14/2023]
Abstract
The spin activity in macromolecules such as DNA and oligopeptides, in the context of the chiral induced spin selectivity has been proposed to be due to the atomic spin-orbit coupling (SOC) and the associated chiral symmetry of the structures. This coupling, associated with carbon, nitrogen and oxygen atoms in biological molecules, albeit small (meV), can be enhanced by the geometry, and strong local polarization effects such as hydrogen bonding. A novel way to manipulate the spin degree of freedom is by modifying the spectrum using a coupling to the appropriate electromagnetic radiation field. Here we use the Floquet formalism in order to show how the half filled band Hamiltonian for DNA, can be modulated by the radiation to produce up to a tenfold increase of the effective SOC once the intrinsic coupling is present. On the other hand, the chiral model, once incorporating the orbital angular momentum of electron motion on the helix, opens a gap for different helicity states (helicity splitting) that chooses spin polarization according to transport direction and chirality, without breaking time reversal symmetry. The observed effects are feasible in physically reasonable parameter ranges for the radiation field amplitude and frequency.
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Affiliation(s)
- Alexander López
- Departamento de Física, Escuela Superior Politécnica del Litoral, ESPOL, Campus Gustavo Galindo Km. 30.5 Vía Perimetral, PO Box 09-01-5863, Guayaquil, Ecuador
| | - Solmar Varela
- Theoretical Condensed Matter Group, School of Chemical Sciences & Engineering, Yachay Tech University, 100119-Urcuquí, Ecuador
| | - Ernesto Medina
- Departamento de Física, Colegio de Ciencias e Ingeniería, Universidad San Francisco de Quito, Diego de Robles y Vía Interoceánica, Quito, 170901, Ecuador
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Salminen SH, Sampo MM, Böhling TO, Salo J, Tarkkanen M, Blomqvist CP, Hukkinen K. Radiation-associated angiosarcoma of the breast: analysis of diagnostic tools in a registry-based population. Acta Radiol 2022; 63:22-27. [PMID: 33349000 DOI: 10.1177/0284185120980142] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Radiation-associated angiosarcoma of the breast (RAASB) is a serious late consequence caused by breast cancer treatment. Initial symptoms are often inconspicuous, thus contributing to diagnostic delay. Most previous studies of the diagnostic aspects of RAASB are case reports. PURPOSE To perform a complete review of the imaging findings and biopsy methods in a nationwide RAASB cohort. MATERIAL AND METHODS RAASB patients were identified from a national cancer registry and additional patients were included from our hospital. All available information from imaging (mammogram [MGR], ultrasound [US], magnetic resonance imaging [MRI], and computed tomography [CT]) and biopsies was reviewed. The sensitivity of imaging and biopsy methods for detection of RAASB was calculated. RESULTS Fifty-eight patients with RAASB were found. Fourteen MGR, 30 US, 24 MRI, and 25 CT studies were available for evaluation. The sensitivity of MGR, US, MRI, and CT for detection of RAASB was 43%, 50%, 92%, and 84%, respectively. Superior sensitivity was demonstrated for punch biopsy (84%) and incisional biopsy (93%) compared to fine-needle aspiration cytology (0%) and core needle biopsy (18%). CONCLUSION MRI and CT have comparable sensitivity for detection of RAASB, while MGR and US are unreliable. However, negative findings in MRI or CT must be interpreted with caution. Punch biopsy and incisional biopsy are the preferred biopsy methods.
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Affiliation(s)
- Samuli Henri Salminen
- Comprehensive Cancer Center, Helsinki University Hospital (HUH) and University of Helsinki, Helsinki, Finland
| | - Mika M Sampo
- Department of Pathology, HUSLAB Helsinki University Hospital (HUH) and University of Helsinki, Helsinki, Finland
| | - Tom O Böhling
- Department of Pathology, University of Helsinki, Helsinki, Finland
| | - Juho Salo
- Department of Plastic Surgery, Helsinki University Hospital (HUH) and University of Helsinki, Helsinki, Finland
| | - Maija Tarkkanen
- Comprehensive Cancer Center, Helsinki University Hospital (HUH) and University of Helsinki, Helsinki, Finland
| | - Carl P Blomqvist
- Comprehensive Cancer Center, Helsinki University Hospital (HUH) and University of Helsinki, Helsinki, Finland
- Department of Oncology, Örebro University Hospital, Örebro, Sweden
| | - Katja Hukkinen
- HUH Medical Imaging Center, Radiology, Helsinki University Hospital (HUH) and University of Helsinki, Helsinki, Finland
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Auttara-atthakorn A, Sungmala J, Anothaisintawee T, Reutrakul S, Sriphrapradang C. Prevention of salivary gland dysfunction in patients treated with radioiodine for differentiated thyroid cancer: A systematic review of randomized controlled trials. Front Endocrinol (Lausanne) 2022; 13:960265. [PMID: 36105397 PMCID: PMC9465079 DOI: 10.3389/fendo.2022.960265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 08/11/2022] [Indexed: 11/28/2022] Open
Abstract
INTRODUCTION Salivary gland dysfunction (e.g., sialadenitis and xerostomia) is the most common complication of radioactive iodine (RAI) therapy for differentiated thyroid cancer (DTC). Several methods have been used to reduce/prevent this adverse effect. We aimed to systematically review the effectiveness of non-pharmacological and pharmacological interventions in preventing RAI-induced salivary gland dysfunction in patients with DTC. METHODS A systematic review was conducted, according to PRISMA guidelines. The protocol was registered (PROSPERO: CRD42022295229). PubMed, Embase, Scopus, and the Cochrane Library electronic databases were searched from inception to November 2021. Inclusion criteria were randomized controlled trials of DTC patients who were older than 18 years and underwent RAI after thyroidectomy in which at least one studied group received an intervention to prevent salivary gland dysfunction. RESULTS Twelve studies (a total of 667 participants) were included. Among DTC patients who were treated with RAI, nonpharmacological treatment such as parotid gland massage and aromatherapy ameliorated salivary gland dysfunction. Antioxidants such as vitamin E and selenium demonstrated radioprotective effects on the salivary gland, while other antioxidants did not show radioprotective benefits. Vitamin C showed no significant effects on preventing salivary gland dysfunction. Amifostine had inconsistent outcomes among studies. Among cholinergic agonists, pilocarpine did not demonstrate the radioprotective effect on parotid glands, while bethanechol lowered salivary gland dysfunction. However, the negative results from pilocarpine may be explained by the strong sialorrheic effect of the Cincinnati regimen in both study arms. CONCLUSION Among non-pharmacological and pharmacological methods, parotid gland massage, aromatherapy, vitamin E, selenium, amifostine, and bethanechol may have benefits in minimizing RAI-induced salivary gland dysfunction in patients with DTC. The results are limited by a small number of patients and should be confirmed in future larger randomized controlled trials. SYSTEMATIC REVIEW REGISTRATION https://www.crd.york.ac.uk/prospero/display_record.php?RecordID=295229, PROSPERO, identifier CRD42022295229.
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Affiliation(s)
- Arunrat Auttara-atthakorn
- Division of Endocrinology and Metabolism, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Jaruwan Sungmala
- Division of Endocrinology and Metabolism, Faculty of Medicine, HRH Princess Maha Chakri Sirindhorn Medical Center, Srinakharinwirot University, Nakornnayok, Thailand
| | - Thunyarat Anothaisintawee
- Department of Family Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Sirimon Reutrakul
- Division of Endocrinology and Metabolism, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, University of Illinois at Chicago, Chicago, IL, United States
| | - Chutintorn Sriphrapradang
- Division of Endocrinology and Metabolism, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
- *Correspondence: Chutintorn Sriphrapradang, ;
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Andresen AK, Jonsson MV, Sulo G, Thelen DS, Shi XQ. Radiographic features in 2D imaging as predictors for justified CBCT examinations of canine-induced root resorption. Dentomaxillofac Radiol 2022; 51:20210165. [PMID: 34324382 PMCID: PMC8693324 DOI: 10.1259/dmfr.20210165] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
OBJECTIVES This retrospective observational study aimed to evaluate the diagnostic accuracy of two-dimensional radiographs on canine-induced root resorption (CIRR) in lateral incisors and identify predictors of CIRR in patients with impacted maxillary canines (IMC). METHODS Ninety-nine patients aged 9-17 years, with 156 IMCs, were included in the study. All had CBCT-volumes and two-dimensional radiographs consisting of at least one panoramic radiograph. Two radiologists jointly viewed all cases twice. First, radiographic features related to the IMC and possible CIRR were recorded from two-dimensional radiographs. Then, CIRR was determined from CBCT and according to position and extension classified as mild, moderate and severe. RESULTS CIRRs was detected in 80% of lateral incisors (mild: 45%; moderate: 44%; severe: 11%). The sensitivity was generally low at mild and moderate cut-offs (29 and 29%), and somewhat higher for severe (50%). Corresponding specificities were 48%, 63% and 68%. Canine cusp-tip superimposing the lateral incisor's middle third and root/crown ratio >1 was positively associated with mild CIRR, with an odds ratio (OR) of 3.8 and 6.7, respectively. In addition, the root development stage was positively associated with moderate/severe CIRR when the canine root was nearly or fully developed (OR = 3.1). CONCLUSIONS The diagnostic accuracy of two-dimensional radiographs was inadequate for detecting CIRR amongst patients referred for CBCT examinations. Based on our results, none of the suggested two-dimensional radiographic features could predict moderate/severe CIRR except for root development stage. IMC in a later stage of root development seems to be associated with a higher risk of moderate/severe CIRR.
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Affiliation(s)
- Amanda K.H. Andresen
- Department of Clinical Dentistry, Section for Oral and Maxillofacial Radiology, University of Bergen, Norway, United Kingdom
| | | | | | - Dorina S. Thelen
- Oral Health Centre of Expertise in Western Norway, Bergen, Norway, United Kingdom
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Jit BP, Pradhan B, Dash R, Bhuyan PP, Behera C, Behera RK, Sharma A, Alcaraz M, Jena M. Phytochemicals: Potential Therapeutic Modulators of Radiation Induced Signaling Pathways. Antioxidants (Basel) 2021; 11:antiox11010049. [PMID: 35052553 PMCID: PMC8773162 DOI: 10.3390/antiox11010049] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 12/22/2021] [Accepted: 12/24/2021] [Indexed: 02/06/2023] Open
Abstract
Ionizing radiation results in extensive damage to biological systems. The massive amount of ionizing radiation from nuclear accidents, radiation therapy (RT), space exploration, and the nuclear battlefield leads to damage to biological systems. Radiation injuries, such as inflammation, fibrosis, and atrophy, are characterized by genomic instability, apoptosis, necrosis, and oncogenic transformation, mediated by the activation or inhibition of specific signaling pathways. Exposure of tumors or normal cells to different doses of ionizing radiation could lead to the generation of free radical species, which can release signal mediators and lead to harmful effects. Although previous FDA-approved agents effectively mitigate radiation-associated toxicities, their use is limited due to their high cellular toxicities. Preclinical and clinical findings reveal that phytochemicals derived from plants that exhibit potent antioxidant activities efficiently target several signaling pathways. This review examined the prospective roles played by some phytochemicals in altering signal pathways associated with radiation response.
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Affiliation(s)
- Bimal Prasad Jit
- School of Life Sciences, Sambalpur University, Jyoti Vihar, Burla 768019, India; (B.P.J.); (R.D.); (R.K.B.)
- Department of Biochemistry, AIIMS, Ansari Nagar, New Delhi 110029, India;
| | - Biswajita Pradhan
- Algal Biotechnology and Molecular Systematic Laboratory, Post Graduate Department of Botany, Berhampur University, Bhanja Bihar, Berhampur 760007, India; (B.P.); (C.B.)
- Department of Biotechnology, Sangmyung University, Seoul 03016, Korea
| | - Rutumbara Dash
- School of Life Sciences, Sambalpur University, Jyoti Vihar, Burla 768019, India; (B.P.J.); (R.D.); (R.K.B.)
| | - Prajna Paramita Bhuyan
- Department of Botany, Maharaja Sriram Chandra Bhanja Deo University, Baripada 757003, India;
| | - Chhandashree Behera
- Algal Biotechnology and Molecular Systematic Laboratory, Post Graduate Department of Botany, Berhampur University, Bhanja Bihar, Berhampur 760007, India; (B.P.); (C.B.)
| | - Rajendra Kumar Behera
- School of Life Sciences, Sambalpur University, Jyoti Vihar, Burla 768019, India; (B.P.J.); (R.D.); (R.K.B.)
| | - Ashok Sharma
- Department of Biochemistry, AIIMS, Ansari Nagar, New Delhi 110029, India;
| | - Miguel Alcaraz
- Radiology and Physical Medicine Department, School of Medicine, Campus de Excelencia Internacional de Ámbito Regional (CEIR)-Campus Mare Nostrum (CMN), Universidad de Murcia, 30100 Murcia, Spain
- Correspondence: (M.A.); (M.J.); Tel.: +34-868883601 (M.A.); +91-7978478950 (M.J.)
| | - Mrutyunjay Jena
- Algal Biotechnology and Molecular Systematic Laboratory, Post Graduate Department of Botany, Berhampur University, Bhanja Bihar, Berhampur 760007, India; (B.P.); (C.B.)
- Correspondence: (M.A.); (M.J.); Tel.: +34-868883601 (M.A.); +91-7978478950 (M.J.)
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Lo Piccolo GM, Cannas M, Agnello S. Intrinsic Point Defects in Silica for Fiber Optics Applications. Materials (Basel) 2021; 14:7682. [PMID: 34947277 PMCID: PMC8703837 DOI: 10.3390/ma14247682] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Revised: 12/03/2021] [Accepted: 12/08/2021] [Indexed: 01/22/2023]
Abstract
Due to its unique properties, amorphous silicon dioxide (a-SiO2) or silica is a key material in many technological fields, such as high-power laser systems, telecommunications, and fiber optics. In recent years, major efforts have been made in the development of highly transparent glasses, able to resist ionizing and non-ionizing radiation. However the widespread application of many silica-based technologies, particularly silica optical fibers, is still limited by the radiation-induced formation of point defects, which decrease their durability and transmission efficiency. Although this aspect has been widely investigated, the optical properties of certain defects and the correlation between their formation dynamics and the structure of the pristine glass remains an open issue. For this reason, it is of paramount importance to gain a deeper understanding of the structure-reactivity relationship in a-SiO2 for the prediction of the optical properties of a glass based on its manufacturing parameters, and the realization of more efficient devices. To this end, we here report on the state of the most important intrinsic point defects in pure silica, with a particular emphasis on their main spectroscopic features, their atomic structure, and the effects of their presence on the transmission properties of optical fibers.
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Affiliation(s)
- Giuseppe Mattia Lo Piccolo
- Dipartimento di Fisica e Chimica, Università Degli Studi di Palermo, Via Archirafi 36, 90123 Palermo, Italy;
- Dipartimento di Fisica e Astronomia, Università Degli Studi di Catania, Via Santa Sofia 64, 95123 Catania, Italy
| | - Marco Cannas
- Dipartimento di Fisica e Chimica, Università Degli Studi di Palermo, Via Archirafi 36, 90123 Palermo, Italy;
| | - Simonpietro Agnello
- Dipartimento di Fisica e Chimica, Università Degli Studi di Palermo, Via Archirafi 36, 90123 Palermo, Italy;
- ATeN Center, Università Degli Studi di Palermo, Viale delle Scienze Ed. 18, 90128 Palermo, Italy
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Gimenez ML, Lipovetzky J, Alcalde Bessia F, Longhino JM, Tartaglione A, Garcia-Inza MA, Blostein JJ, Carbonetto S, Gómez Berisso M, Pérez M, Sidelnik I, Redin EG, Faigón A. Neutron-gamma dosimetry for BNCT using field oxide transistors with gadolinium oxide as neutron converter layer. Med Phys 2021; 49:1276-1285. [PMID: 34851535 DOI: 10.1002/mp.15385] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 11/02/2021] [Accepted: 11/06/2021] [Indexed: 11/11/2022] Open
Abstract
PURPOSE A new type of electronic dosimeter is presented, capable of discerning between the doses of gamma photons and neutrons in a mixed beam as found in boron neutron capture therapy (BNCT). We introduce a real-time dosimeter based on a thick gate field oxide field effect transistor (FOXFET) covered with a neutron converter layer containing gadolinium. METHODS To sensitize the FOXFET dosimeter to neutron fluxes, a converter layer containing gadolinium oxide particles embedded in photoresines was deposited over the sensor surface. Mixed neutron-gamma field configurations with different neutron energy spectra were used to assess the FOXFET response, considering different thicknesses of the neutron converter layer. RESULTS The total gamma sensitivity of the devices resulted to be 43 mV/Gy. The responses of sensors with different converter layer thicknesses irradiated with different neutron spectra are simulated using GEANT4 code. The response to photons is not significantly modified with thin conversion layers when used in water medium. CONCLUSIONS A real-time dosimeter comprising a pair of FOXFET sensors-only one of them with a gadolinium neutron converter layer-allows the simultaneous measurement of gamma dose and neutron flux during BNCT irradiations.
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Affiliation(s)
- Melisa Lucía Gimenez
- Centro Atómico Bariloche, San Carlos de Bariloche, Río Negro, Argentina.,Comisión Nacional de Energía Atómica (CNEA), San Carlos de Bariloche, Río Negro, Argentina.,Instituto Balseiro, Universidad Nacional de Cuyo, San Carlos de Bariloche, Río Negro, Argentina
| | - José Lipovetzky
- Centro Atómico Bariloche, San Carlos de Bariloche, Río Negro, Argentina.,Comisión Nacional de Energía Atómica (CNEA), San Carlos de Bariloche, Río Negro, Argentina.,Instituto Balseiro, Universidad Nacional de Cuyo, San Carlos de Bariloche, Río Negro, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad Autónoma de Buenos Aires, Argentina
| | - Fabricio Alcalde Bessia
- Centro Atómico Bariloche, San Carlos de Bariloche, Río Negro, Argentina.,Instituto Balseiro, Universidad Nacional de Cuyo, San Carlos de Bariloche, Río Negro, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad Autónoma de Buenos Aires, Argentina
| | - Juan Manuel Longhino
- Centro Atómico Bariloche, San Carlos de Bariloche, Río Negro, Argentina.,Comisión Nacional de Energía Atómica (CNEA), San Carlos de Bariloche, Río Negro, Argentina.,Instituto Balseiro, Universidad Nacional de Cuyo, San Carlos de Bariloche, Río Negro, Argentina
| | - Aureliano Tartaglione
- Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstraße, Garching bei München, Germany
| | - Mariano Andrés Garcia-Inza
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad Autónoma de Buenos Aires, Argentina.,Facultad de Ingeniería, Universidad de Buenos Aires (UBA), Ciudad Autónoma de Buenos Aires, Argentina
| | - Juan Jerónimo Blostein
- Centro Atómico Bariloche, San Carlos de Bariloche, Río Negro, Argentina.,Instituto Balseiro, Universidad Nacional de Cuyo, San Carlos de Bariloche, Río Negro, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad Autónoma de Buenos Aires, Argentina
| | - Sebastián Carbonetto
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad Autónoma de Buenos Aires, Argentina.,Facultad de Ingeniería, Universidad de Buenos Aires (UBA), Ciudad Autónoma de Buenos Aires, Argentina
| | - Mariano Gómez Berisso
- Centro Atómico Bariloche, San Carlos de Bariloche, Río Negro, Argentina.,Instituto Balseiro, Universidad Nacional de Cuyo, San Carlos de Bariloche, Río Negro, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad Autónoma de Buenos Aires, Argentina
| | - Martín Pérez
- Centro Atómico Bariloche, San Carlos de Bariloche, Río Negro, Argentina.,Comisión Nacional de Energía Atómica (CNEA), San Carlos de Bariloche, Río Negro, Argentina.,Instituto Balseiro, Universidad Nacional de Cuyo, San Carlos de Bariloche, Río Negro, Argentina
| | - Iván Sidelnik
- Centro Atómico Bariloche, San Carlos de Bariloche, Río Negro, Argentina.,Instituto Balseiro, Universidad Nacional de Cuyo, San Carlos de Bariloche, Río Negro, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad Autónoma de Buenos Aires, Argentina
| | - Eduardo Gabriel Redin
- Facultad de Ingeniería, Universidad de Buenos Aires (UBA), Ciudad Autónoma de Buenos Aires, Argentina
| | - Adrián Faigón
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad Autónoma de Buenos Aires, Argentina.,Facultad de Ingeniería, Universidad de Buenos Aires (UBA), Ciudad Autónoma de Buenos Aires, Argentina
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Bazyka DA, Sushko VO, Chumak AA, Fedirko PA, Talko VV, Yanovych LA. STATE INSTITUTION «NATIONAL RESEARCH CENTER FOR RADIATION MEDICINE OF THE NATIONAL ACADEMY OF MEDICAL SCIENCES OF UKRAINE» - RESEARCH ACTIVITIES AND SCIENTIFIC ADVANCE IN 2020. Probl Radiac Med Radiobiol 2021; 26:10-17. [PMID: 34965540 DOI: 10.33145/2304-8336-2021-26-10-17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Indexed: 06/14/2023]
Abstract
Research activities and scientific advance achieved in 2020 at the State Institution «National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine» (NRCRM) concerning medical problems of the Chornobyl disaster, radiation medicine, radiobiology, radiation hygiene and epidemiology in collaboration with the WHO network of medical preparedness and assistance in radiation accidents are outlined in the annual report. The report presents the results of fundamental and applied research works of the study of radiation effects and health effects of the Chornobyl accident. The report also shows the results of scientific-organizational and health care work, staff training. The Scientific Council meeting of NAMS approved the NRCRM Annual Report.
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Affiliation(s)
- D A Bazyka
- State Institution «National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine», 53 Yuriia Illienka Str., Kyiv, 04050, Ukraine
| | - V O Sushko
- State Institution «National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine», 53 Yuriia Illienka Str., Kyiv, 04050, Ukraine
| | - A A Chumak
- State Institution «National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine», 53 Yuriia Illienka Str., Kyiv, 04050, Ukraine
| | - P A Fedirko
- State Institution «National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine», 53 Yuriia Illienka Str., Kyiv, 04050, Ukraine
| | - V V Talko
- State Institution «National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine», 53 Yuriia Illienka Str., Kyiv, 04050, Ukraine
| | - L A Yanovych
- State Institution «National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine», 53 Yuriia Illienka Str., Kyiv, 04050, Ukraine
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Lie RT. Invited Commentary: Ionizing Radiation and Future Reproductive Health-Old Cohorts Still Deserve Attention. Am J Epidemiol 2021; 190:2334-2336. [PMID: 34023897 DOI: 10.1093/aje/kwab156] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 04/19/2021] [Accepted: 04/20/2021] [Indexed: 01/08/2023] Open
Abstract
Radiation from nuclear weapons or power plants has caused great concern among the public-concern that needs to be addressed with the best available data. Among the concerns associated with ionizing radiation are possible serious and far-reaching effects on reproductive health. Relevant data that can be used to address these concerns are scarce. The Hiroshima and Nagasaki bombings of World War II and the 1986 Chernobyl disaster in Ukraine are probably among the most dramatic and important sources of information on health effects, but much of the information is historical, and the exposed cohorts are getting old. In their accompanying article, Yamada et al. (Am J Epidemiol. 2021;190(11):2323-2333) revisit data on reproductive health outcomes in survivors of the Hiroshima and Nagasaki bombings during the years after the blasts. Exposure levels were very high, but after Yamada et al.'s reanalysis, effect estimates were low, and the evidence for overall effects on birth defects and perinatal mortality is still weak. The authors acknowledge that their data have limitations and that the generalizability of the findings is limited by the devastating conditions that prevailed in the 2 Japanese cities after the blasts.
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Yamada M, Furukawa K, Tatsukawa Y, Marumo K, Funamoto S, Sakata R, Ozasa K, Cullings HM, Preston DL, Kurttio P. Congenital Malformations and Perinatal Deaths Among the Children of Atomic Bomb Survivors: A Reappraisal. Am J Epidemiol 2021; 190:2323-2333. [PMID: 33847738 PMCID: PMC8561127 DOI: 10.1093/aje/kwab099] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 02/25/2021] [Accepted: 02/26/2021] [Indexed: 12/26/2022] Open
Abstract
From 1948 to 1954, the Atomic Bomb Casualty Commission conducted a study of pregnancy outcomes among births to atomic bomb survivors (Hiroshima and Nagasaki, Japan) who had received radiation doses ranging from 0 Gy to near-lethal levels. Past reports (1956, 1981, and 1990) on the cohort did not identify significant associations of radiation exposure with untoward pregnancy outcomes, such as major congenital malformations, stillbirths, or neonatal deaths, individually or in aggregate. We reexamined the risk of major congenital malformations and perinatal deaths in the children of atomic bomb survivors (n = 71,603) using fully reconstructed data to minimize the potential for bias, using refined estimates of the gonadal dose from Dosimetry System 2002 and refined analytical methods for characterizing dose-response relationships. The analyses showed that parental exposure to radiation was associated with increased risk of major congenital malformations and perinatal death, but the estimates were imprecise for direct radiation effects, and most were not statistically significant. Nonetheless, the uniformly positive estimates for untoward pregnancy outcomes among children of both maternal and paternal survivors are useful for risk assessment purposes, although extending them to populations other than the atomic bomb survivors comes with uncertainty as to generalizability.
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Affiliation(s)
- Michiko Yamada
- Correspondence to Dr. Michiko Yamada, Department of Clinical Studies, Radiation Effects Research Foundation, 5-2 Hijiyama Park, Minami-ku, Hiroshima 732-0815, Japan (e-mail: )
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Fernandes A, Oliveira A, Soares R, Barata P. The Effects of Ionizing Radiation on Gut Microbiota, a Systematic Review. Nutrients 2021; 13:3025. [PMID: 34578902 PMCID: PMC8465723 DOI: 10.3390/nu13093025] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 08/20/2021] [Accepted: 08/26/2021] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND The human gut microbiota is defined as the microorganisms that collectively inhabit the intestinal tract. Its composition is relatively stable; however, an imbalance can be precipitated by various factors and is known to be associated with various diseases. Humans are daily exposed to ionizing radiation from ambient and medical procedures, and gastrointestinal side effects are not rare. METHODS A systematic search of PubMed, EMBASE, and Cochrane Library databases was conducted. Primary outcomes were changes in composition, richness, and diversity of the gut microbiota after ionizing radiation exposure. Standard methodological procedures expected by Cochrane were used. RESULTS A total of 2929 nonduplicated records were identified, and based on the inclusion criteria, 11 studies were considered. Studies were heterogeneous, with differences in population and outcomes. Overall, we found evidence for an association between ionizing radiation exposure and dysbiosis: reduction in microbiota diversity and richness, increase in pathogenic bacteria abundance (Proteobacteria and Fusobacteria), and decrease in beneficial bacteria (Faecalibacterium and Bifidobacterium). CONCLUSIONS This review highlights the importance of considering the influence of ionizing radiation exposure on gut microbiota, especially when considering the side effects of abdominal and pelvic radiotherapy. Better knowledge of these effects, with larger population studies, is needed.
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Affiliation(s)
- Ana Fernandes
- Department of Nuclear Medicine, Centro Hospitalar Universitário de São João, E.P.E., 4200-319 Porto, Portugal;
| | - Ana Oliveira
- Department of Nuclear Medicine, Centro Hospitalar Universitário de São João, E.P.E., 4200-319 Porto, Portugal;
| | - Raquel Soares
- Department of Biomedicine, Faculdade de Medicina da Universidade do Porto, 4200-319 Porto, Portugal;
- i3S, Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-135 Porto, Portugal;
| | - Pedro Barata
- i3S, Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-135 Porto, Portugal;
- Department of Pharmaceutical Science, Faculdade de Ciências da Saúde da Universidade Fernando Pessoa, 4249-004 Porto, Portugal
- Department of Pathology, Centro Hospitalar Universitário do Porto, 4099-001 Porto, Portugal
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Niu M, Gao H, Zhao Z, Wang H, Su L, Zhuang L, Jia S, Navrotsky A. Radiation Effects in the Crystalline-Amorphous SiOC Polymer-Derived Ceramics: Insights from Experiments and Molecular Dynamics Simulation. ACS Appl Mater Interfaces 2021; 13:40106-40117. [PMID: 34383473 DOI: 10.1021/acsami.1c10917] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Radiation-tolerant materials are in great demand for safe operation and advancement of nuclear and aerospace systems. Nanostructuring is a key strategy to improve the radiation tolerance of materials. SiOC polymer-derived ceramics (PDCs) are unique synthetic nanocomposites consisting of β-SiC nanocrystals and turbostratic graphite distributed in amorphous SiOC matrix, which are "all-rounder" materials for many advanced structural and functional applications. Radiation effects in the crystalline-amorphous system have been investigated in detail by experiments and molecular dynamics (MD) simulations. The results indicate that the amorphous SiOC structure retains amorphous accompanied by redistribution of the Si-containing tetrahedra. The graphite is shown to amorphize more easily than β-SiC nanocrystals under the same irradiation condition. The sample richer in oxygen, namely, containing more amorphous SiOC, shows less disordering of graphite, resulting from greater mitigation of radiation damage by the amorphous phase as efficient sinks. This study provides details of the microstructure evolution of SiOC PDCs under ion irradiation, as well as insights for the design and development of advanced ion damage-resistant materials.
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Affiliation(s)
- Min Niu
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Hongfei Gao
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Zihao Zhao
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Hongjie Wang
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Lei Su
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Lei Zhuang
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Shuhai Jia
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Alexandra Navrotsky
- School of Molecular Sciences and Center for Materials of the Universe, Arizona State University, Tempe, Arizona 85287, United States
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Rana S, Subbaraman H, Fleming A, Kandadai N. Numerical Analysis of Radiation Effects on Fiber Optic Sensors. Sensors (Basel) 2021; 21:4111. [PMID: 34203744 PMCID: PMC8232191 DOI: 10.3390/s21124111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 06/10/2021] [Accepted: 06/12/2021] [Indexed: 11/16/2022]
Abstract
Optical fiber sensors (OFS) are a potential candidate for monitoring physical parameters in nuclear environments. However, under an irradiation field the optical response of the OFS is modified via three primary mechanisms: (i) radiation-induced attenuation (RIA), (ii) radiation-induced emission (RIE), and (iii) radiation-induced compaction (RIC). For resonance-based sensors, RIC plays a significant role in modifying their performance characteristics. In this paper, we numerically investigate independently the effects of RIC and RIA on three types of OFS widely considered for radiation environments: fiber Bragg grating (FBG), long-period grating (LPG), and Fabry-Perot (F-P) sensors. In our RIC modeling, experimentally calculated refractive index (RI) changes due to low-dose radiation are extrapolated using a power law to calculate density changes at high doses. The changes in RI and length are subsequently calculated using the Lorentz-Lorenz relation and an established empirical equation, respectively. The effects of both the change in the RI and length contraction on OFS are modeled for both low and high doses using FIMMWAVE, a commercially available vectorial mode solver. An in-depth understanding of how radiation affects OFS may reveal various potential OFS applications in several types of radiation environments, such as nuclear reactors or in space.
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Affiliation(s)
- Sohel Rana
- Department of Electrical and Computer Engineering, Boise State University, Boise, ID 83725, USA; (S.R.); (H.S.)
- Idaho National Laboratory, 1955 N Fremont Avenue, Idaho Falls, ID 83415, USA;
| | - Harish Subbaraman
- Department of Electrical and Computer Engineering, Boise State University, Boise, ID 83725, USA; (S.R.); (H.S.)
| | - Austin Fleming
- Idaho National Laboratory, 1955 N Fremont Avenue, Idaho Falls, ID 83415, USA;
| | - Nirmala Kandadai
- Department of Electrical and Computer Engineering, Boise State University, Boise, ID 83725, USA; (S.R.); (H.S.)
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Li Y, Kwong DLW, Wu VWC, Yip SP, Law HKW, Lee SWY, Ying MTC. Computer-assisted ultrasound assessment of plaque characteristics in radiation-induced and non-radiation-induced carotid atherosclerosis. Quant Imaging Med Surg 2021; 11:2292-2306. [PMID: 34079702 DOI: 10.21037/qims-20-1012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Background This study investigated the feasibility of using a computer-assisted method to evaluate and differentiate the carotid plaque characteristics in radiation-induced and non-radiation-induced carotid atherosclerosis. Methods This study included 107 post-radiotherapy (post-RT) nasopharyngeal carcinoma (NPC) patients and 110 subjects with cardiovascular risk factors (CVRFs). Each participant had a carotid ultrasound examination, and carotid plaques and carotid intima-media thickness (CIMT) were evaluated with grey scale ultrasound. The carotid plaque characteristics were evaluated for grey-scale median (GSM) and detailed plaque texture analysis (DPTA) using specific computer software. In DPTA, five different intra-plaque components were colour-coded according to different grey scale ranges. A multivariate linear regression model was used to evaluate the correlation of risk factors and carotid plaque characteristics. Results Post-RT NPC patients have significantly higher CIMT (748±15.1 µm, P=0.001), more patients had a plaque formation (80.4%, P<0.001) and more plaque locations (2.3±0.2, P<0.001) than CVRF subjects (680.4±10.0 µm, 38.2% and 0.5±0.1 respectively). Among the five intra-plaque components, radiation-induced carotid plaques had significantly larger area of calcification (4.8%±7.7%, P=0.012), but lesser area of lipid (42.1%±16.9%, P=0.034) when compared to non-radiation-induced carotid plaques (3.0%±5.7% and 46.3%±17.9% respectively). Age, radiation and number of CVRF were significantly associated with the carotid atherosclerosis burden (P<0.001). Besides, age was significantly associated with the amount of lipid and calcification within carotid plaques (P<0.001). Conclusions Radiation caused more severe carotid artery disease than CVRF with larger CIMT and more prevalent of carotid plaque. Radiation-induced carotid plaques tended to have more intra-plaque calcifications, whereas non-radiation-induced carotid plaques had more lipids. Ultrasound aided by computer-assisted image analysis has potential for more accurate assessment of carotid atherosclerosis.
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Affiliation(s)
- Yuanxi Li
- Department of Health Technology and Informatics, The Hong Kong Polytechnic University, Hong Kong, China
| | - Dora Lai-Wan Kwong
- Department of Clinical Oncology, The University of Hong Kong, Queen Mary Hospital, Hong Kong, China
| | - Vincent Wing-Cheung Wu
- Department of Health Technology and Informatics, The Hong Kong Polytechnic University, Hong Kong, China
| | - Shea-Ping Yip
- Department of Health Technology and Informatics, The Hong Kong Polytechnic University, Hong Kong, China
| | - Helen Ka-Wai Law
- Department of Health Technology and Informatics, The Hong Kong Polytechnic University, Hong Kong, China
| | - Shara Wee-Yee Lee
- Department of Health Technology and Informatics, The Hong Kong Polytechnic University, Hong Kong, China
| | - Michael Tin-Cheung Ying
- Department of Health Technology and Informatics, The Hong Kong Polytechnic University, Hong Kong, China
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Spałek MJ, Czarnecka AM, Rutkowski P. The Management of Radiation-Induced Sarcomas: A Cohort Analysis from a Sarcoma Tertiary Center. J Clin Med 2021; 10:jcm10040694. [PMID: 33578934 PMCID: PMC7916641 DOI: 10.3390/jcm10040694] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 02/05/2021] [Accepted: 02/05/2021] [Indexed: 12/23/2022] Open
Abstract
(1) Background: Radiation-induced sarcomas (RIS) are rare diseases with poor prognoses. The aim of the study was to analyze outcomes and identify factors affecting survival in a cohort of patients with RIS. (2) Methods: We included consecutive patients with RIS that we found in the available electronic medical records of a sarcoma tertiary center. We analyzed patients’ RIS characteristics, management of RIS, the occurrence of local recurrence and distant metastases, the date of disease progression, the date of death, and the date of the last follow-up. (3) Results: Fifty-eight patients met the inclusion criteria. The most frequent sites of RIS development were the thorax and pelvis. The majority of RIS were poorly differentiated, high-grade tumors. Forty patients underwent surgery or radiotherapy with curative intent. The others were referred to palliative chemotherapy. Median progression-free survival and overall survival were 15 and 21 months, respectively. Treatment with curative intent and tumor localization on breasts and upper extremities were associated with a lower risk of death in univariate analysis. (4) Conclusions: The study confirms the poor prognosis of RIS. Treatments with locally curative intent at the tumor site are of prognostic value. Secondary radiotherapy is rarely used in RIS.
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Affiliation(s)
- Mateusz Jacek Spałek
- Department of Soft Tissue/Bone Sarcoma and Melanoma, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland; (A.M.C.); (P.R.)
- Correspondence: ; Tel.: +48-22-546-2455
| | - Anna Małgorzata Czarnecka
- Department of Soft Tissue/Bone Sarcoma and Melanoma, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland; (A.M.C.); (P.R.)
- Department of Experimental Pharmacology, Mossakowski Medical Research Centre, Polish Academy of Sciences, 02-106 Warsaw, Poland
| | - Piotr Rutkowski
- Department of Soft Tissue/Bone Sarcoma and Melanoma, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland; (A.M.C.); (P.R.)
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Olivares A, Alcaraz-Saura M, Achel DG, Berná-Mestre JD, Alcaraz M. Radiation-Induced Bystander Effect: Loss of Radioprotective Capacity of Rosmarinic Acid In Vivo and In Vitro. Antioxidants (Basel) 2021; 10:231. [PMID: 33546480 DOI: 10.3390/antiox10020231] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 01/21/2021] [Accepted: 01/30/2021] [Indexed: 01/19/2023] Open
Abstract
In radiation oncology, the modulation of the bystander effect is a target both for the destruction of tumor cells and to protect healthy cells. With this objective, we determine whether the radioprotective capacity of rosmarinic acid (RA) can affect the intensity of these effects. Genoprotective capacity was obtained by determining the micronuclei frequencies in in vivo and in vitro assays and the cell survival was determined by the (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay) (MTT) assay in three cell lines (PNT2, TRAMPC1 and B16F10), both in direct exposure to X-rays and after the production of radiation-induced bystander effect. The administration of RA in irradiated cells produced a decrease in the frequency of micronuclei both in vivo and in vitro, and an increase in cell survival, as expression of its radioprotective effect (p < 0.001) attributable to its ability to scavenge radio-induced free radicals (ROS). However, RA does not achieve any modification in the animals receiving serum or in the cultures treated with the irradiated medium, which expresses an absence of radioprotective capacity. The results suggest that ROS participates in the formation of signals in directly irradiated cells, but only certain subtypes of ROS, the cytotoxic products of lipid peroxidation, participate in the creation of lesions in recipient cells.
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Maruyama K, Wang B, Doi K, Ishibashi K, Ichikawa S, Furuhata Y, Kubota M, Watanabe Y. Radiation effects on wild medaka around Fukushima Dai-ichi Nuclear Power Plant assessed by micronucleus assay. J Radiat Res 2021; 62:79-85. [PMID: 33326996 PMCID: PMC7779352 DOI: 10.1093/jrr/rraa116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 05/28/2020] [Indexed: 06/12/2023]
Abstract
Since the Fukushima Dai-ichi Nuclear Power Plant (F1-NPP) accident in 2011, radiation effects on wildlife in the contaminated areas have been a major concern. The outskirts of the F1-NPP are mainly rural areas, where many rice fields, streams and reservoirs are located. We searched for wild medaka (small aquarium fish) around the F1-NPP and found two wild medaka habitats (S1 and S2). S1 is a stream located 4 km from the F1-NPP, where the ambient dose equivalent rate was 0.4-0.9 μSv/h (2013-14), and S2 is a reservoir located 7.5 km from the F1-NPP, where the ambient dose equivalent rate was 9.8-22 μSv/h (2013-14 and 2017-18). Dosimeters were placed for one day at the locations where the medaka were captured, and the absorbed dose rates were estimated. Radiation effects on wild medaka were examined using micronucleus assay between 2013 and 2018. No significant difference in frequency of micronucleated gill cells was observed among the wild medaka from S1, S2 and our cultivated medaka that were used as a control.
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Affiliation(s)
- Kouichi Maruyama
- Corresponding author: Department of Radioecology and Fukushima Project, Center for Advanced Radiation Emergency Medicine, Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan. Tel: +81-43-206-3085; Fax: +81-43- 251-4582;
| | - Bing Wang
- Department of Radiation Effects Research, National Institute of Radiological Sciences, Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-Ku, Chiba 263-8555, Japan
| | - Kazutaka Doi
- Center for Radiation Protection Knowledge, National Institute of Radiological Sciences, Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Koji Ishibashi
- Tokyo College of Environment, 3-3-7 Kotobashi, Sumida-ku, Tokyo 130-0022, Japan
| | - San’ei Ichikawa
- Japan Wildlife Research Center, 3-3-7 Kotobashi, Sumida-ku, Tokyo 130-8606, Japan
| | - Yoshiaki Furuhata
- Japan Wildlife Research Center, 3-3-7 Kotobashi, Sumida-ku, Tokyo 130-8606, Japan
| | - Masahide Kubota
- Japan Wildlife Research Center, 3-3-7 Kotobashi, Sumida-ku, Tokyo 130-8606, Japan
| | - Yoshito Watanabe
- Department of Radioecology and Fukushima Project, Center for Advanced Radiation Emergency Medicine, Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
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