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Bastidas-Bonilla KA, Podesta-Lerma PLM, Vega-Carrillo HR, Castañeda-Priego R, Sarmiento-Gómez E, Gómez-Solís C, Vallejo MA, Sosa MA. Fluorescent organic particle doped polymer-based gel dosimeter for neutron detection. Appl Radiat Isot 2021; 180:110067. [PMID: 34929612 DOI: 10.1016/j.apradiso.2021.110067] [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: 07/18/2021] [Revised: 12/07/2021] [Accepted: 12/13/2021] [Indexed: 11/28/2022]
Abstract
The purpose of this work is to develop a material capable of detecting neutrons produced by photodisintegration in a linear accelerator for its medical use. In this study, we have developed a gel-like material doped with fluorescent organic particles. PPO at 1 wt% is used as primary dopant and POPOP as secondary one at 0.03 wt%. A set of four samples is produced, with boric acid concentrations of 0, 400, 800 and 1200 ppm. The viscoelastic properties of the material are characterized with rheological measurements, finding a gel-like behavior, i.e., a material that can keep its original shape if no stresses are applied, but can also be deformed by applying a moderate shear rate. Furthermore, the material was irradiated with gamma, electron, and neutron emission sources from 137Cs, 22Na, 60Co, 210Po, 90Sr and 241AmBe, and its response was measured in two different experimental settings, in two different institutions, for comparative purposes. From these measurements, one can clearly establish that the new material detects neutrons, electrons, and gammas within the MeV regions and below. Thus, our findings show that the developed material and its properties make it a promising technology for its use in a neutron detector.
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Affiliation(s)
- Karla A Bastidas-Bonilla
- Universidad de Guanajuato, División de Ciencias e Ingenierías, Loma del Bosque 103, 37150, León, Gto, Mexico
| | - Pedro L M Podesta-Lerma
- Facultad de Ciencias Físico-Matemáticas, Universidad Autónoma de Sinaloa, Av. de las Américas y Blvd.Universitario, 80000, Culiacán, Sin, Mexico
| | - Hector R Vega-Carrillo
- Universidad Autónoma de Zacatecas, Unidad Académica de Estudios Nucleares, Ciprés 10, 98000, Zacatecas, Zac, Mexico
| | - Ramón Castañeda-Priego
- Universidad de Guanajuato, División de Ciencias e Ingenierías, Loma del Bosque 103, 37150, León, Gto, Mexico
| | - Erick Sarmiento-Gómez
- Universidad de Guanajuato, División de Ciencias e Ingenierías, Loma del Bosque 103, 37150, León, Gto, Mexico
| | - Christian Gómez-Solís
- Universidad de Guanajuato, División de Ciencias e Ingenierías, Loma del Bosque 103, 37150, León, Gto, Mexico
| | - Miguel A Vallejo
- Universidad de Guanajuato, División de Ciencias e Ingenierías, Loma del Bosque 103, 37150, León, Gto, Mexico
| | - Modesto A Sosa
- Universidad de Guanajuato, División de Ciencias e Ingenierías, Loma del Bosque 103, 37150, León, Gto, Mexico.
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Dhakal R, Yosofvand M, Moussa H. Development and Application of MAGIC-f Gel in Cancer Research and Medical Imaging. Applied Sciences 2021; 11:7783. [DOI: 10.3390/app11177783] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Much of the complex medical physics work requires radiation dose delivery, which requires dosimeters to accurately measure complex three-dimensional dose distribution with good spatial resolution. MAGIC-f polymer gel is one of the emerging new dosimeters widely used in medical physics research. The purpose of this study was to present an overview of polymer gel dosimetry, using MAGIC-f gel, including its composition, manufacture, imaging, calibration, and application to medical physics research. In this review, the history of polymer gel development is presented, along with the applications so far. Moreover, the most important experiments/applications of MAGIC-f polymer gel are discussed to illustrate the behavior of gel on different conditions of irradiation, imaging, and manufacturing techniques. Finally, various future works are suggested based on the past and present works on MAGIC-f gel and polymer gel in general, with the hope that these bits of knowledge can provide important clues for future research on MAGIC-f gel as a dosimeter.
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Aboelezz E, Abdelgawad MH, Eman S, Hassan G. Evaluation of thermal neutron dose from Am-Be source using gelatinized boron fricke dosimeter. Radiat Phys Chem Oxf Engl 1993 2019. [DOI: 10.1016/j.radphyschem.2019.04.037] [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: 10/27/2022]
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Bavarnegin E, Khalafi H, Sadremomtaz A, Kasesaz Y, Khajeali A. Investigation of Dose Distribution in Mixed Neutron-Gamma Field of Boron Neutron Capture Therapy using N -Isopropylacrylamide Gel. Nuclear Engineering and Technology 2017; 49:189-95. [DOI: 10.1016/j.net.2016.07.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Ishikawa M, Yamamoto T, Matsumura A, Hiratsuka J, Miyatake SI, Kato I, Sakurai Y, Kumada H, Shrestha SJ, Ono K. Early clinical experience utilizing scintillator with optical fiber (SOF) detector in clinical boron neutron capture therapy: its issues and solutions. Radiat Oncol 2016; 11:105. [PMID: 27506665 PMCID: PMC4977859 DOI: 10.1186/s13014-016-0680-0] [Citation(s) in RCA: 10] [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: 10/16/2015] [Indexed: 11/29/2022] Open
Abstract
Background Real-time measurement of thermal neutrons in the tumor region is essential for proper evaluation of the absorbed dose in boron neutron capture therapy (BNCT) treatment. The gold wire activation method has been routinely used to measure the neutron flux distribution in BNCT irradiation, but a real-time measurement using gold wire is not possible. To overcome this issue, the scintillator with optical fiber (SOF) detector has been developed. The purpose of this study is to demonstrate the feasibility of the SOF detector as a real-time thermal neutron monitor in clinical BNCT treatment and also to report issues in the use of SOF detectors in clinical practice and their solutions. Material and methods Clinical measurements using the SOF detector were carried out in 16 BNCT clinical trial patients from December 2002 until end of 2006 at the Japanese Atomic Energy Agency (JAEA) and Kyoto University Research Reactor Institute (KURRI). Results The SOF detector worked effectively as a real-time thermal neutron monitor. The neutron fluence obtained by the gold wire activation method was found to differ from that obtained by the SOF detector. The neutron fluence obtained by the SOF detector was in better agreement with the expected fluence than with gold wire activation. The estimation error for the SOF detector was small in comparison to the gold wire measurement. In addition, real-time monitoring suggested that the neutron flux distribution and intensity at the region of interest (ROI) may vary due to the reactor condition, patient motion and dislocation of the SOF detector. Conclusion Clinical measurements using the SOF detector to measure thermal neutron flux during BNCT confirmed that SOF detectors are effective as a real-time thermal neutron monitor. To minimize the estimation error due to the displacement of the SOF probe during treatment, a loop-type SOF probe was developed.
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Affiliation(s)
- Masayori Ishikawa
- Department of Biomedical Science and Engineering, Graduate School of Health Science, Hokkaido University, N-12 W-5 Kita-ku, Sapporo, Hokkaido, 060-0812, Japan.
| | - Tetsuya Yamamoto
- Faculty of Medicine, University of Tsukuba, Ibaraki, 305-8575, Japan
| | - Akira Matsumura
- Faculty of Medicine, University of Tsukuba, Ibaraki, 305-8575, Japan
| | - Junichi Hiratsuka
- Department of Radiation Oncology, Kawasaki Medical School, Okayama, 701-0192, Japan
| | - Shin-Ichi Miyatake
- Department of Neurosurgery, Osaka Medical College, Osaka, 569-0084, Japan
| | - Itsuro Kato
- Graduate School of Dentistry, Osaka University, Osaka, 565-0871, Japan
| | - Yoshinori Sakurai
- Research Reactor Institute, Kyoto University, Osaka, 590-0494, Japan
| | - Hiroaki Kumada
- Faculty of Medicine, University of Tsukuba, Ibaraki, 305-8575, Japan
| | - Shubhechha J Shrestha
- Department of Biomedical Science and Engineering, Graduate School of Health Science, Hokkaido University, N-12 W-5 Kita-ku, Sapporo, Hokkaido, 060-0812, Japan
| | - Koji Ono
- Research Reactor Institute, Kyoto University, Osaka, 590-0494, Japan
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Gambarini G, Artuso E, Giove D, Volpe L, Agosteo S, Barcaglioni L, Campi F, Garlati L, Pola A, Durisi E, Borroni M, Carrara M, Klupak V, Marek M, Viererbl L, Vins M, d’Errico F. Fricke-gel dosimetry in epithermal or thermal neutron beams of a research reactor. Radiat Phys Chem Oxf Engl 1993 2015. [DOI: 10.1016/j.radphyschem.2015.03.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Gambarini G, Artuso E, Giove D, Felisi M, Volpe L, Barcaglioni L, Agosteo S, Garlati L, Pola A, Klupak V, Viererbl L, Vins M, Marek M. Study of suitability of Fricke-gel-layer dosimeters for in-air measurements to characterise epithermal/thermal neutron beams for NCT. Appl Radiat Isot 2015; 106:145-50. [PMID: 26249744 DOI: 10.1016/j.apradiso.2015.07.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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: 01/30/2015] [Revised: 06/15/2015] [Accepted: 07/25/2015] [Indexed: 11/30/2022]
Abstract
The reliability of Fricke gel dosimeters in form of layers for measurements aimed at the characterization of epithermal neutron beams has been studied. By means of dosimeters of different isotopic composition (standard, containing (10)B or prepared with heavy water) placed against the collimator exit, the spatial distribution of gamma and fast neutron doses and of thermal neutron fluence are attained. In order to investigate the accuracy of the results obtained with in-air measurements, suitable MC simulations have been developed and experimental measurements have been performed utilizing Fricke gel dosimeters, thermoluminescence detectors and activation foils. The studies were related to the epithermal beam designed for BNCT irradiations at the research reactor LVR-15 (Řež). The results of calculation and measurements have revealed good consistency of gamma dose and fast neutron 2D distributions obtained with gel dosimeters in form of layers. In contrast, noticeable modification of thermal neutron fluence is caused by the neutron moderation produced by the dosimeter material. Fricke gel dosimeters in thin cylinders, with diameter not greater than 3mm, have proved to give good results for thermal neutron profiling. For greater accuracy of all results, a better knowledge of the dependence of gel dosimeter sensitivity on radiation LET is needed.
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Affiliation(s)
- G Gambarini
- Department of Physics, Università degli Studi di Milano, Milan, Italy; INFN, Istituto Nazionale di Fisica Nucleare, Italy.
| | - E Artuso
- Department of Physics, Università degli Studi di Milano, Milan, Italy; INFN, Istituto Nazionale di Fisica Nucleare, Italy
| | - D Giove
- Department of Physics, Università degli Studi di Milano, Milan, Italy; INFN, Istituto Nazionale di Fisica Nucleare, Italy
| | - M Felisi
- Department of Physics, Università degli Studi di Milano, Milan, Italy
| | - L Volpe
- Department of Physics, Università degli Studi di Milano, Milan, Italy; INFN, Istituto Nazionale di Fisica Nucleare, Italy
| | - L Barcaglioni
- Energy Department, Politecnico di Milano, Milan, Italy; INFN, Istituto Nazionale di Fisica Nucleare, Italy
| | - S Agosteo
- Energy Department, Politecnico di Milano, Milan, Italy; INFN, Istituto Nazionale di Fisica Nucleare, Italy
| | - L Garlati
- Energy Department, Politecnico di Milano, Milan, Italy
| | - A Pola
- Energy Department, Politecnico di Milano, Milan, Italy; INFN, Istituto Nazionale di Fisica Nucleare, Italy
| | - V Klupak
- Department of Neutron Physics, Research Centre Řež, Czech Republic
| | - L Viererbl
- Department of Neutron Physics, Research Centre Řež, Czech Republic
| | - M Vins
- Department of Neutron Physics, Research Centre Řež, Czech Republic
| | - M Marek
- Department of Neutron Physics, Research Centre Řež, Czech Republic
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Khajeali A, Farajollahi AR, Khodadadi R, Kasesaz Y, Khalili A. Role of gel dosimeters in boron neutron capture therapy. Appl Radiat Isot 2015; 103:72-81. [PMID: 26070173 DOI: 10.1016/j.apradiso.2015.05.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 02/10/2015] [Accepted: 05/26/2015] [Indexed: 12/27/2022]
Abstract
Gel dosimeters have acquired a unique status in radiotherapy, especially with the advent of the new techniques in which there is a need for three-dimensional dose measurement with high spatial resolution. One of the techniques in which the use of gel dosimeters has drawn the attention of the researchers is the boron neutron capture therapy. Exploring the history of gel dosimeters, this paper sets out to study their role in the boron neutron capture therapy dosimetric process.
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Gambarini G, Bartesaghi G, Burian J, Carrara M, Marek M, Negri A, Pirola L, Viererbl L. Fast-neutron dose evaluation in BNCT with Fricke gel layer detectors. RADIAT MEAS 2010. [DOI: 10.1016/j.radmeas.2010.05.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Mangueira T, Silva C, Coelho P, Campos L. Gamma/neutron dose evaluation using Fricke gel and alanine gel dosimeters to be applied in boron neutron capture therapy. Appl Radiat Isot 2010; 68:791-4. [DOI: 10.1016/j.apradiso.2010.01.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Marrale M, Brai M, Gennaro G, Bartolotta A, D'Oca MC. The Effect of Gadolinium on the ESR Response of Alanine and Ammonium Tartrate Exposed to Thermal Neutrons. Radiat Res 2008; 169:232-9. [DOI: 10.1667/rr1138.1] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2007] [Accepted: 09/17/2007] [Indexed: 11/03/2022]
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Uusi-Simola J, Heikkinen S, Kotiluoto P, Serén T, Seppälä T, Auterinen I, Savolainen S. MAGIC polymer gel for dosimetric verification in boron neutron capture therapy. J Appl Clin Med Phys 2007; 8:114-23. [PMID: 17592463 PMCID: PMC5722414 DOI: 10.1120/jacmp.v8i2.2409] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2006] [Revised: 02/06/2007] [Accepted: 12/31/1969] [Indexed: 11/23/2022] Open
Abstract
Radiation sensitive polymer gels are among the most promising three-dimensional dose verification tools developed to date. Polymer gel dosimeter known by the acronym MAGIC has been tested for evaluation of its use in boron neutron capture (BNCT) dosimetry. We irradiated a large (diameter 10 cm, length 20 cm) cylindrical gel phantom in the epithermal neutron beam of the Finnish BNCT facility at the FiR 1 nuclear reactor. Neutron irradiation was simulated with a Monte Carlo radiation transport code MCNP. Gel samples from the same production batch were also irradiated with 6 MV photons from a medical linear accelerator to compare dose response in the two different types of beams. Irradiated gel phantoms were imaged using MRI to determine their relaxation rate R2 maps. The measured and normalized dose distribution in the epithermal neutron beam was compared to the dose distribution calculated by computer simulation. The results support the feasibility MAGIC gel in BNCT dosimetry.
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Affiliation(s)
- Jouni Uusi-Simola
- HUS, Medical Imaging Centre, Helsinki University Central Hospital, Finland.
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Bufalino D, Cerullo N, Colli V, Gambarini G, Rosi G. Gadolinium dosimetry, a problematic issue in the neutron capture therapy. Comparison between experiments and computational simulations. ACTA ACUST UNITED AC 2006. [DOI: 10.1088/1742-6596/41/1/019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Gambarini G, Carrara M, Gay S, Tomatis S. Dose imaging with gel-dosemeter layers: optical analysis and dedicated software. Radiat Prot Dosimetry 2006; 120:144-7. [PMID: 16891350 DOI: 10.1093/rpd/nci625] [Citation(s) in RCA: 8] [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] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
In radiotherapy involving thermal and epithermal neutrons, the knowledge of dose distributions, with separation of the contribution of each secondary radiation component, is of utmost importance. Layers of Fricke-Xylenol-Orange-infused gel dosemeters give the possibility of achieving such requirements because, owing to the layer-geometry, enriching or depleting the gel matrix of suitable isotopes does not sensibly alter neutron transport. The dosimetry method has been critically re-examined with the aim of improving its suitability to boron neutron capture therapy (BNCT) requirements, as it applies to the protocol of measurement and analysis, the sensitivity of the method and the range of the linearity of the dosemeters. Software has been developed and studied to obtain automatically the images of the various dose components with the established separation procedure.
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Affiliation(s)
- G Gambarini
- Department of Physics of the University, Milan, Italy.
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Gambarini G, Colli V, Gay S, Petrovich C, Pirola L, Rosi G. In-phantom imaging of all dose components in boron neutron capture therapy by means of gel dosimeters. Appl Radiat Isot 2005; 61:759-63. [PMID: 15308140 DOI: 10.1016/j.apradiso.2004.05.061] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [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: 11/22/2022]
Abstract
The experimental method for in-phantom imaging and profiling the absorbed dose in neutron capture therapy has been improved. The method separates the contributions of the various secondary radiation components and is based on suitably designed gel dosimeters in the form of layers. The discrimination of the dose components is achieved by means of pixel-to-pixel manipulations of images obtained with gel dosimeters having different isotopic composition. Large dose images are obtainable with this method, because the layer geometry of dosimeters avoids sensible variation of neutron transport due to the isotopic composition of gel. Operation modalities aimed at attaining more reliable results have been studied. Some results, together with the results of punctual measurements performed with conventional dosimeters and with MC calculations, are here reported.
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Affiliation(s)
- G Gambarini
- Dipartimento di Fisica, Universita degli studi di Milano, via Celoria 16, 20133 Milano, Italy.
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Gambarini G, Klamert V, Agosteo S, Birattari C, Gay S, Rosi G, Scolari L. Study of a method based on TLD detectors for in-phantom dosimetry in BNCT. Radiat Prot Dosimetry 2004; 110:631-636. [PMID: 15353721 DOI: 10.1093/rpd/nch109] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A method has been developed, based on thermoluminescent dosemeters (TLD), aimed at measuring the absorbed dose in tissue-equivalent phantoms exposed to thermal or epithermal neutrons, separating the contributions of various secondary radiation generated by neutrons. The proposed method takes advantage of the very low sensitivity of CaF2:Tm (TLD-300) to low energy neutrons and to the different responses to thermal neutrons of LiF:Mg,Ti dosemeters with different 6Li percentage (TLD-100, TLD-700, TLD-600). The comparison of the results with those obtained by means of gel dosemeters and activation foils has confirmed the reliability of the method. The experimental modalities allowing reliable results have been studied. The glow curves of TLD-300 after gamma or neutron irradiation have been compared; moreover, both internal irradiation effect and energy dependence have been investigated. For TLD-600, TLD-100 and TLD-700, the suitable fluence limits have been determined in order to avoid radiation damage and loss of linearity.
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Affiliation(s)
- G Gambarini
- Department of Physics of the University, via Celoria 16, 20133 Milan, Italy.
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Burn KW, Colli V, Curzio G, d'Errico F, Gambarini G, Rosi G, Scolari L. Characterisation of the TAPIRO BNCT epithermal facility. Radiat Prot Dosimetry 2004; 110:645-649. [PMID: 15353724 DOI: 10.1093/rpd/nch161] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A collimated epithermal beam for boron neutron capture therapy (BNCT) research has been designed and built at the TAPIRO fast research reactor. A complete experimental characterisation of the radiation field in the irradiation chamber has been performed, to verify agreement with IAEA requirements. Slow neutron fluxes have been measured by means of an activation technique and with thermoluminescent detectors (TLDs). The fast neutron dose has been determined with gel dosemeters, while the fast neutron spectrum has been acquired by means of a neutron spectrometer based on superheated drop detectors. The gamma-dose has been measured with gel dosemeters and TLDs. For an independent verification of the experimental results, fluxes, doses and neutron spectra have been calculated with Monte Carlo simulations using the codes MCNP4B and MCNPX_2.1.5 with the direct statistical approach (DSA). The results obtained confirm that the epithermal beams achievable at TAPIRO are of suitable quality for BNCT purposes.
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Affiliation(s)
- K W Burn
- FIS-NUC, ENEA, via Martiri di Montesole 4, Bologna, Italy
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Rosi G, Gambarini G, Colli V, Gay S, Scolari L, Fiorani O, Perrone A, Nava E, Fasolo F, Visca L, Zanini A. Characterisation of the TAPIRO BNCT thermal facility. Radiat Prot Dosimetry 2004; 110:651-654. [PMID: 15353725 DOI: 10.1093/rpd/nch172] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Dosimetry and spectrometry measurements have been carried out in the thermal column of the research fast reactor RSV-TAPIRO (ENEA-Casaccia, Rome) in order to investigate its suitability for irradiation of cells or mice, with a view to research in the interests of boron neutron capture therapy (BNCT). The thermal column consists of a graphite moderator (40 cm thick) containing a lead shield (13 cm thick) in order to shield reactor background. The irradiation volume, inside this structure, has cubic shape (18 x 18 x 18 cm3). Besides measurements of fluence and dose rates in air or in phantom performed with thermoluminescence dosemeters (TLDs) and using the activation technique, dose and fluence profiles have been generated using a method based on gel dosemeters analysed with optical imaging. To check the consistency of the results, spectrometry measurements in the same irradiation volume have been performed by means of bubble detectors.
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Affiliation(s)
- G Rosi
- ENEA FIS-ION, CR Casaccia, via Anguillarese 301, I-00060 Roma, Italy.
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Uusi-Simola J, Savolainen S, Kangasmäki A, Heikkinen S, Perkiö J, Abo Ramadan U, Seppälä T, Karila J, Serén T, Kotiluoto P, Sorvari P, Auterinen I. Study of the relative dose-response of BANG-3 polymer gel dosimeters in epithermal neutron irradiation. Phys Med Biol 2003; 48:2895-906. [PMID: 14516107 DOI: 10.1088/0031-9155/48/17/310] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [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
Polymer gels have been reported as a new, potential tool for dosimetry in mixed neutron-gamma radiation fields. In this work, BANG-3 (MGS Research Inc.) gel vials from three production batches were irradiated with 6 MV photons of a Varian Clinac 2100 C linear accelerator and with the epithermal neutron beam of the Finnish boron neutron capture therapy (BNCT) facility at the FiR 1 nuclear reactor. The gel is tissue equivalent in main elemental composition and density and its T2 relaxation time is dependent on the absorbed dose. The T2 relaxation time map of the irradiated gel vials was measured with a 1.5 T magnetic resonance (MR) scanner using spin echo sequence. The absorbed doses of neutron irradiation were calculated using DORT computer code, and the accuracy of the calculational model was verified by measuring gamma ray dose rate with thermoluminescent dosimeters and 55Mn(n,gamma) activation reaction rate with activation detectors. The response of the BANG-3 gel dosimeter for total absorbed dose in the neutron irradiation was linear, and the magnitude of the response relative to the response in the photon irradiation was observed to vary between different gel batches. The results support the potential of polymer gels in BNCT dosimetry, especially for the verification of two- or three-dimensional dose distributions.
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Affiliation(s)
- J Uusi-Simola
- Department of Radiology, Helsinki University Central Hospital, FIN-00029 HUS, Finland
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