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Smith L, López Sánchez GF, Veronese N, Soysal P, Rahmati M, Jacob L, Kostev K, Haro JM, Alghamdi AA, Butler L, Barnett Y, Keyes H, Tully MA, Shin JI, Koyanagi A. Dynapenic Abdominal Obesity Increases Risk for Falls Among Adults Aged ≥50 Years: A Prospective Analysis of the Irish Longitudinal Study on Ageing. J Gerontol A Biol Sci Med Sci 2024; 79:glad104. [PMID: 37071490 DOI: 10.1093/gerona/glad104] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Indexed: 04/19/2023] Open
Abstract
BACKGROUND There is a scarcity of studies examining the longitudinal relationship between dynapenic abdominal obesity (DAO; ie, impairment in muscle strength and high waist circumference) and future fall risk. Therefore, we aimed to investigate the prospective association between DAO at baseline and falls occurring during 2 years of follow-up in a nationally representative sample of middle-aged and older individuals from Ireland. METHODS Data from 2 consecutive waves of the Irish Longitudinal Study on Ageing survey were analyzed. Dynapenia was defined as handgrip strength of <26 kg for men and <16 kg for women. Abdominal obesity was defined as a waist circumference of >88 cm for women and >102 cm for men. DAO was assessed at Wave 1 (2009-2011) and was defined as having both dynapenia and abdominal obesity. Falls occurring between Wave 1 and Wave 2 (2012-2013) were self-reported. Multivariable logistic regression analysis was conducted. RESULTS Data on 5 275 individuals aged ≥50 years were analyzed (mean [standard deviation {SD}] age 63.2 [8.9] years; 48.8% males). After adjustment for potential confounders, compared to no dynapenia and no abdominal obesity at baseline, DAO was significantly associated with 1.47 (95% confidence interval [CI]: 1.14-1.89) times higher odds for falls at 2-year follow-up. Dynapenia alone (odds ratio [OR] = 1.08; 95% CI: 0.84-1.40) and abdominal obesity alone (OR = 1.09; 95% CI: 0.91-1.29) were not significantly associated with falls at follow-up. CONCLUSIONS DAO increased the risk for falls among middle-aged and older adults in Ireland. Interventions to prevent or reverse DAO may be beneficial for fall reduction.
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Affiliation(s)
- Lee Smith
- Centre for Health Performance and Wellbeing, Anglia Ruskin University, Cambridge, UK
| | - Guillermo F López Sánchez
- Division of Preventive Medicine and Public Health, Department of Public Health Sciences, School of Medicine, University of Murcia, Murcia, Spain
| | - Nicola Veronese
- Department of Internal Medicine, Geriatrics Section, University of Palermo, Palermo, Italy
| | - Pinar Soysal
- Department of Geriatric Medicine, Faculty of Medicine, Bezmialem Vakif University, Istanbul, Turkey
| | - Masoud Rahmati
- Department of Physical Education and Sport Sciences, Faculty of Literature and Human Sciences, Lorestan University, Khoramabad, Iran
| | - Louis Jacob
- Research and Development Unit, Parc Sanitari Sant Joan de Déu, Sant Boi de Llobregat, Barcelona, Spain
- Faculty of Medicine, University of Versailles Saint-Quentin-en-Yvelines, Versailles, France
| | | | - Josep Maria Haro
- Research and Development Unit, Parc Sanitari Sant Joan de Déu, Sant Boi de Llobregat, Barcelona, Spain
| | | | - Laurie Butler
- Centre for Health Performance and Wellbeing, Anglia Ruskin University, Cambridge, UK
| | - Yvonne Barnett
- Centre for Health Performance and Wellbeing, Anglia Ruskin University, Cambridge, UK
| | - Helen Keyes
- School of Psychology and Sport Science, Anglia Ruskin University, Cambridge, UK
| | - Mark A Tully
- School of Medicine, Ulster University, Londonderry, Northern Ireland, UK
| | - Jae Il Shin
- Department of Pediatrics, Yonsei University College of Medicine, Seoul, South Korea
| | - Ai Koyanagi
- Research and Development Unit, Parc Sanitari Sant Joan de Déu, Sant Boi de Llobregat, Barcelona, Spain
- ICREA, Pg. Lluis Companys, Barcelona, Spain
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Smith L, López Sánchez GF, Haro JM, Alghamdi AA, Pizzol D, Tully MA, Oh H, Gibson P, Keyes H, Butler L, Barnett Y, Shin JI, Koyanagi A. Temporal Trends in Bullying Victimization Among Adolescents Aged 12-15 Years From 29 Countries: A Global Perspective. J Adolesc Health 2023; 73:582-590. [PMID: 37389527 DOI: 10.1016/j.jadohealth.2023.04.031] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 04/14/2023] [Accepted: 04/29/2023] [Indexed: 07/01/2023]
Abstract
PURPOSE Bullying victimization among adolescents is a major public health concern. However, multicountry studies investigating temporal trends of bullying victimization among adolescents are scarce, especially from a global perspective. Thus, we aimed to examine the temporal trends of bullying victimization among school-going adolescents between 2003 and 2017 in 29 countries from Africa (n = 5), Asia (n = 18), and the Americas (n = 6). METHODS Data on 191,228 students aged 12-15 years [mean (standard deviation) age 13.7 (1.0) years; 48.9% boys] who participated in the Global School-based Student Health Survey were analyzed. Bullying victimization was based on self-report and referred to being bullied at least once in the past 30 days. The prevalence (95% confidence interval) of bullying victimization was calculated for each survey. Crude linear trends in bullying victimization were examined by linear regression models. RESULTS The mean prevalence of bullying victimization across all surveys was 39.4%. There was a large variation in the trends of bullying victimization across countries with a significant increasing and decreasing trend being observed in 6 and 13 countries, respectively. Myanmar, Egypt, and the Philippines showed the sharpest increase. The decrease was modest in most countries which showed a decreasing trend. The remaining countries showed stable trends (n = 10) but some countries such as Seychelles showed consistently high prevalence over time (i.e., ≥ 50%). DISCUSSION Decreasing trends of bullying victimization were more common than increasing or stable trends in our study including adolescents from 29 countries. However, a high prevalence of bullying was observed in most countries, and thus, further global efforts to combat bullying victimization are necessary.
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Affiliation(s)
- Lee Smith
- Centre for Health Performance and Wellbeing, Anglia Ruskin University, Cambridge, United Kingdom
| | - Guillermo F López Sánchez
- Division of Preventive Medicine and Public Health, Department of Public Health Sciences, School of Medicine, University of Murcia, Murcia, Spain.
| | - Josep Maria Haro
- Research and Development Unit, Parc Sanitari Sant Joan de Déu, CIBERSAM, ISCIII, Barcelona, Spain; Psychology Department, College of Education, King Saud University, Riyadh, Saudi Arabia
| | | | - Damiano Pizzol
- Italian Agency for Development Cooperation, Khartoum, Sudan
| | - Mark A Tully
- School of Medicine, Ulster University, Northern Ireland, United Kingdom
| | - Hans Oh
- Suzanne Dworak Peck School of Social Work, University of Southern California, Los Angeles, California
| | - Poppy Gibson
- Faculty of Education and Social Care, Anglia Ruskin University, Chelmsford, United Kingdom
| | - Helen Keyes
- School of Psychology and Sport Science, Anglia Ruskin University, Cambridge, United Kingdom
| | - Laurie Butler
- Centre for Health Performance and Wellbeing, Anglia Ruskin University, Cambridge, United Kingdom
| | - Yvonne Barnett
- Centre for Health Performance and Wellbeing, Anglia Ruskin University, Cambridge, United Kingdom
| | - Jae Il Shin
- Department of Pediatrics, Yonsei University College of Medicine, Seoul, South Korea.
| | - Ai Koyanagi
- Research and Development Unit, Parc Sanitari Sant Joan de Déu, CIBERSAM, ISCIII, Barcelona, Spain; ICREA, Pg. Lluis Companys 23, Barcelona, Spain
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Alghamdi AA, Gartner C, Najman J, Smirnov A. Co-administering cannabis with tobacco and persistent tobacco smoking after 4½ years in young adults who use stimulants: A prospective population-based study. J Psychoactive Drugs 2022; 54:119-128. [PMID: 34254884 DOI: 10.1080/02791072.2021.1947546] [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: 12/08/2020] [Revised: 04/22/2021] [Accepted: 05/13/2021] [Indexed: 10/20/2022]
Abstract
Tobacco smoking remains highly prevalent in high-risk groups, including young adults who use cannabis and a variety of other drugs. We examine whether co-administering cannabis with tobacco is associated with heavier and more persistent tobacco smoking compared to separate use of these substances among young adults who use drugs recreationally. Data are from a prospective population-based study of young adults residing in Queensland, Australia, who recurrently used ecstasy or methamphetamine. The mean age was 20.8 years at baseline, and 47% were female. An ordinal regression model was developed (n = 277) with levels of tobacco smoking at 4½ years as the outcome. At baseline, just under half the sample (44.6%) had not co-administered cannabis with tobacco in the last month, 9.5% rarely co-administered, 7.7% sometimes co-administered, and 38.2% always co-administered. Always co-administering cannabis with tobacco was associated with more frequent and persistent tobacco smoking at 4½ years (Odds Ratio (OR): 1.98, 95% Confidence Interval (CI): 1.02, 3.83), independently of factors including baseline frequency of cannabis and tobacco use. Young adults who use cannabis should be advised not to co-administrate cannabis with tobacco, and comprise an important target group for tobacco smoking cessation interventions.
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Affiliation(s)
- Abdullah Ahmed Alghamdi
- School of Public Health, Faculty of Medicine, The University of Queensland, Brisbane, Australia
- Faculty of Public Health and Health Informatics, Umm Al-Qura University, Mecca, Saudi Arabia
| | - Coral Gartner
- School of Public Health, Faculty of Medicine, The University of Queensland, Brisbane, Australia
| | - Jake Najman
- School of Public Health, Faculty of Medicine, The University of Queensland, Brisbane, Australia
| | - Andrew Smirnov
- Senior Lecturer and Director of Research Training, School of Public Health, Faculty of Medicine, The University of Queensland, Brisbane, Australia
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Almarghlani AA, Alshehri MA, Alghamdi AA, Sindi MA, Assaggaf MA, Al-Dabbagh NN. Infection-Control knowledge, attitude, practice and risk perception of occupational exposure to COVID-19 among dentists: A cross-sectional survey. Niger J Clin Pract 2022; 25:1029-1037. [DOI: 10.4103/njcp.njcp_1459_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Ahmed Alghamdi A, Gartner C, Najman JM, Chan G, Smirnov A. The Relationship between Cannabis and Tobacco Co-administration and Long-Term Patterns of Cannabis Use in Young Adults Who Use Stimulants: A Prospective Population-Based Study. Subst Use Misuse 2021; 57:11-20. [PMID: 34796786 DOI: 10.1080/10826084.2021.1975744] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND Co-administering cannabis with tobacco (i.e. co-administration of the substances mixed together) is a common practice among cannabis users, but the consequences of this practice are not well understood. This study examines the relationship between co-administering cannabis with tobacco and the long-term frequency of cannabis use in a young adult population group with high rates of cannabis and tobacco use. METHODS The data are from an Australian prospective population-based study of young adults who recurrently used amphetamine-type stimulants (ATS). The mean age of participants was 20.8 years at baseline, sample size (n = 277), and 47% were female. We examined the frequency and quantity of cannabis consumption over 4 ½ years. Negative binomial regression analysis was conducted to examine the frequency of cannabis use at 12-month follow-up and at 4 ½ years, with co-administering practices as the predictor. RESULTS At every time interval, participants who always co-administered their cannabis with tobacco used cannabis on more days in the last month than those who only sometimes co-administered, rarely co-administered, or never co-administered these substances (p < 0.001). Sometimes co-administering cannabis with tobacco at baseline predicted more frequent cannabis use at 12-month follow-up (adjusted IRR: 2.25, 95% CI: 1.05, 4.78), independently of the baseline frequency of cannabis use. However, levels of co-administering cannabis with tobacco at 12-month follow-up (rarely, sometimes, and always) did not predict high levels of cannabis use at 4 ½ years follow-up after adjusting for cannabis use at 12-month follow-up. CONCLUSIONS Among people who use ATS and cannabis, frequent cannabis use may be a marker of the practice of co-administering cannabis with tobacco, and can be used to target tobacco cessation interventions in these populations.
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Affiliation(s)
- Abdullah Ahmed Alghamdi
- School of Public Health, The University of Queensland Faculty of Medicine, Herston, Australia
- Teaching Assistant, Faculty of Public Health and Health Informatics, Umm Al-Qura University, Mecca, Saudi Arabia
| | - Coral Gartner
- School of Public Health, The University of Queensland - Saint Lucia Campus, Herston, Australia
| | - Jake M Najman
- Queensland Alcohol and Drug Research and Education Centre, School of Population Health, The University of Queensland, Herston, Australia
| | - Gary Chan
- University of Queensland, Brisbane, Australia
| | - Andrew Smirnov
- Queensland Alcohol and Drug Research and Education Centre, School of Population Health, Level 1 Public Health Building, University of Queensland, Herston, Australia
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Alzahrani MM, Alghamdi AA, Alghamdi SA, Alotaibi RK. Knowledge and Attitude of Dentists Towards Obstructive Sleep Apnoea. Int Dent J 2021; 72:315-321. [PMID: 34193341 PMCID: PMC9275360 DOI: 10.1016/j.identj.2021.05.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2021] [Revised: 05/10/2021] [Accepted: 05/12/2021] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Obstructive sleep apnoea (OSA) is the most common sleep-related breathing disorder. Dentists should play an essential role in OSA screening, referral, and management. However, few studies have investigated dentists' knowledge and attitude towards OSA. OBJECTIVE This cross-sectional survey aimed to assess the level of knowledge and attitude regarding OSA amongst dentists and evaluate whether the level of knowledge affects their attitude towards OSA. METHODS Using the Google Forms platform, an online questionnaire was distributed via e-mail to all Ministry of Health dentists (N = 352). The questionnaire included 3 sections: demographics, knowledge, and attitude. Participant responses were stratified by professional title (general dentists, specialists, or consultants) and practice sector (primary health care centres or hospitals). Descriptive statistics, independent t tests, one-way analyses of variance, and Pearson's correlation were used to analyse the data. RESULTS Of the 352 dentists, 191 responded to the questionnaire (54.55%). Although 80.6% of the respondents reported having previous OSA knowledge in the self-assessment question, 65.58% scored below 12 in the total knowledge scores, and 63.35% scored below 3 in the total attitude scores based on Bloom's cutoff. The mean total knowledge score was 9.86, while the mean total attitude score was 2.08. No significant differences between the mean total knowledge and attitude scores were found based on sex, professional title, or practice sector. A positive and statistically significant correlation was found between total knowledge and attitude scores (P value = .001). CONCLUSIONS This study showed that dentists had a low OSA-related knowledge and a negative attitude towards OSA, and a positive association was seen between knowledge level and attitude. Dental practitioners with high knowledge scores tended to have a positive attitude towards OSA. These findings suggest that dentists in Jeddah require more education and clinical training in sleep medicine to maximise patient benefits and minimise adverse outcomes.
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Alghamdi AA, Law GR, Scott EM, Ellison GTH. OP51 Latent class analysis reveals six distinct sleep patterns that are associated with a range of sociodemographic characteristics in the UK population. Br J Soc Med 2016. [DOI: 10.1136/jech-2016-208064.51] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Alghamdi AA, Scott EM, Law GR, Ellison GTH. PP65 Simplifying the measurement of sleep quality: latent variable analysis of seven conceptual sleep criteria. Br J Soc Med 2014. [DOI: 10.1136/jech-2014-204726.160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Abstract
BACKGROUND Surgical site infection has been estimated to occur in about 15% of clean surgery and 30% of contaminated surgery. Using plastic adhesive drapes to protect the wound from organisms that may be present on the surrounding skin during surgery is one strategy used to prevent surgical site infection. Results from non-randomised studies have produced conflicting results about the efficacy of this approach but no systematic review has been conducted to date to guide clinical practice. OBJECTIVES To assess the effect of adhesive drapes used during surgery on surgical site infection, cost, mortality and morbidity. SEARCH STRATEGY We searched the Cochrane Wounds Group Specialised Register (last searched 24/4/07), the Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library Issue 2,2007), Ovid MEDLINE (1950 to April Week 2, 2007), Ovid EMBASE (1980 to 2007 Week 16), and Ovid CINAHL (1982 to 1980 to April Week 2 2007). SELECTION CRITERIA Randomised controlled trials comparing any plastic adhesive drape with no adhesive drape, used alone or in combination with woven (material) drapes or disposable (paper) drapes in patients undergoing any type of surgery. DATA COLLECTION AND ANALYSIS Two authors independently selected and assessed studies for trial quality and both independently extracted data. Study authors were contacted for additional information. MAIN RESULTS This review includes five studies involving 3,082 participants comparing adhesive drapes with no drape and two studies involving 1,113 participants comparing iodine-impregnated adhesive drapes with no drape. A significantly higher proportion of patients in the adhesive drape group developed a surgical site infection when compared with no drape. (Relative Risk (RR) 1.23, 95% Confidence Intervals (CI) 1.02 to 1.48, p=0.03). Iodine-impregnated adhesive drapes had no effect on the surgical site infection rate (RR 1.03, 95% CI 0.064 to 1.66, p=0.89). Length of hospital stay was similar in adhesive drape and non-adhesive drape groups. AUTHORS' CONCLUSIONS There was no evidence from the seven trials that plastic adhesive drapes reduces surgical site infection rate and some evidence that they increase infection rates. Further trials may be justified using blinded outcome assessment to examine the effect of adhesive drapes on surgical site infection based on different wound classifications.
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Affiliation(s)
- J Webster
- Royal Brisbane and Royal Women's Hospital, Centre for Clinical Nursing, Level 2, Building 34, Butterfield Street, Herston, Queensland, Australia, 4029.
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Shehata N, Naglie G, Alghamdi AA, Callum J, Mazer CD, Hebert P, Streiner D, Wilson K. Risk factors for red cell transfusion in adults undergoing coronary artery bypass surgery: a systematic review. Vox Sang 2007; 93:1-11. [PMID: 17547559 DOI: 10.1111/j.1423-0410.2007.00924.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND AND OBJECTIVE Identifying factors that can predict adults at high risk of receiving red blood cell transfusion during coronary artery bypass graft (CABG) surgery may aid in more efficient blood banking practices and may tailor blood conservation strategies for these adult patients. The objective was to identify clinical factors associated with increased red cell transfusion in adults undergoing CABG surgery. METHODS A systematic review of the MEDLINE and HealthSTAR databases from 1966 to December 2005 was conducted. Citations containing the medical subject heading or textwords 'coronary artery bypass graft', 'CABG' and 'cardiovascular surgery' were combined with the medical subject headings or textwords 'transfusion' and 'blood transfusion'. RESULTS A total of 2461 abstracts were retrieved. Twenty-one studies met the inclusion/exclusion criteria. Transfusion rates ranged from 7 to 97%. Several variables were identified that were associated with increased red cell transfusion rates including older age, female sex, low haemoglobin concentration or haematocrit value, renal insufficiency and urgent/emergent surgery. The strongest risk factor was the urgency of surgery (urgent or emergent surgery), which was associated with a 4x to 8x increase in transfusion rates compared to elective surgery. Increasing age and female sex increased the likelihood of transfusion by 1x to 3x and 2x, respectively. CONCLUSIONS Increasing patient age, female sex, lower preoperative haemoglobin levels, as well as the urgency of the CABG surgery were associated with higher transfusion rates. Identifying risk factors for transfusion may allow for targeted use of blood conservation strategies, improved efficiency in blood utilization and informing adults at risk of transfusion.
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Affiliation(s)
- N Shehata
- Division of Haematology, St. Michael's Hospital, Toronto, Ontario, Canada.
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Webster J, Alghamdi AA, Born S. Use of plastic adhesive drapes during surgery for preventing surgical site infection. THE COCHRANE DATABASE OF SYSTEMATIC REVIEWS 2007. [DOI: 10.1002/14651858.cd006353] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Alghamdi AA, Ma A, Marouli M, Albarakati Y, Kacperek A, Spyrou NM. A high-resolution anthropomorphic voxel-based tomographic phantom for proton therapy of the eye. Phys Med Biol 2007; 52:N51-9. [PMID: 17202616 DOI: 10.1088/0031-9155/52/2/n02] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Proton therapy is increasingly used in medical treatments for cancer patients due to the sharp dose conformity offered by the characteristic Bragg peak. Proton beam interactions with the eye will be simulated using the MCNPX Monte Carlo code and available nuclear cross-section data to calculate the dose distribution in the eye gel and surrounding organs. A high-resolution eye model will be employed using a 3D geometrical voxel-based anthropomorphic head phantom obtained from the Visible Human Project (female data). Manual segmentation of the eye, carried out by the Medical Physics group at the University of Surrey resulted in 15 identified structures. This work emphasizes the use of a realistic phantom for accurately predicting dose deposition by protons.
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Affiliation(s)
- A A Alghamdi
- Department of Physics, University of Surrey Guildford, Surrey GU2 7XH, UK.
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Alghamdi AA, Ma A, Tzortzis M, Spyrou NM. Neutron-fluence-to-dose conversion coefficients in an anthropomorphic phantom. Radiat Prot Dosimetry 2005; 115:606-11. [PMID: 16381792 DOI: 10.1093/rpd/nci268] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
A set of fluence-to-effective-dose conversion coefficients has been calculated for neutrons with energies <20 MeV using a high-resolution anthropomorphic phantom (Zubal model) and the MCNPX code. The calculation used 13 monodirectional monoenergetic neutron beams in the energy range 10(-9) to 20 MeV, under three different source irradiation configurations: anterior-posterior, posterior-anterior and left lateral. Dose calculations were performed for 18 selected organs of the body, for which the International Commission on Radiological Protection and the International Commission on Radiological Units and Measurements have set tissue weighting factors for the determination of the effective dose. Another set of neutron-fluence-to-effective-dose conversion coefficients was also calculated with the proposed modification wR from ICRP Publication 92. From comparison between the dose results calculated and the data reported for the MIRD and VIPMAN models, it can be concluded that, although some discrepancies exist between the Zubal model and the two other models, there is good agreement in the left lateral irradiation geometry.
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Affiliation(s)
- A A Alghamdi
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, UK.
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