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Ferreira CVG, Piedade JS, Prado MRD, Benavente J, Mendes BM, Paixão L, Fonseca TCF. Monte Carlo calculation of whole body counter efficiency factors for different computational phantoms. Appl Radiat Isot 2023; 194:110685. [PMID: 36758323 DOI: 10.1016/j.apradiso.2023.110685] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 12/28/2022] [Accepted: 01/15/2023] [Indexed: 02/09/2023]
Abstract
Individual monitoring can provide an estimate of the radioactivity present in the body of the exposed individuals. Periodic monitoring of occupationally exposed individuals is of great importance in case of accidental incorporation. Computational phantoms and Monte Carlo codes are often used to complement the calibration method of counting systems in internal dosimetry. Here, counting efficiency (CE) factors for a WBC system were calculated using MC simulations. The WBC system with a NaI(Tl) detector and the BOMAB phantom was modeled using three MC codes. After validation, the models were used to obtain CE values for a wide range of energies, and a CE curve was generated for the WBC system. To estimate the effects of anatomical differences on the measurement process, two anthropomorphic voxel phantoms were modeled using the VMC code. For the detector position with the highest CE value, the differences when comparing BOMAB results with the MaMP and Yale results were (-1 ± 6)% and (-1 ± 3)%, respectively. The results confirm that the use of the BOMAB phantom is a good approach for the calibration of the whole-body counter system. Measurements should be made at detector position with the highest CE values, and it is recommended to use the mean Monte Carlo CE values calculated in this work.
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Affiliation(s)
- Carlos V G Ferreira
- Universidade Federal de Minas Gerais, Escola de Engenharia - Departamento de Engenharia Nuclear, Programa de Pós-graduação em Ciências e Técnicas Nucleares, Av. Pres. Antônio Carlos 6627, Belo Horizonte MG, Brazil.
| | - Jennifer S Piedade
- Universidade Federal de Minas Gerais, Faculdade de Medicina - Departamento de Anatomia e Imagem, Av. Prof. Alfredo Balena 190, Belo Horizonte, MG, Brazil
| | - Max R D Prado
- Centro universitário de Belo Horizonte, Av. Mário Werneck 1685, Belo Horizonte MG, Brazil
| | - Jhonny Benavente
- Universidade Federal de Minas Gerais, Escola de Engenharia - Departamento de Engenharia Nuclear, Programa de Pós-graduação em Ciências e Técnicas Nucleares, Av. Pres. Antônio Carlos 6627, Belo Horizonte MG, Brazil
| | - Bruno M Mendes
- Centro de Desenvolvimento da Tecnologia Nuclear - CDTN/CNEN, Av. Pres. Antônio Carlos 6627, Belo Horizonte MG, Brazil
| | - Lucas Paixão
- Universidade Federal de Minas Gerais, Faculdade de Medicina - Departamento de Anatomia e Imagem, Av. Prof. Alfredo Balena 190, Belo Horizonte, MG, Brazil
| | - Telma C F Fonseca
- Universidade Federal de Minas Gerais, Escola de Engenharia - Departamento de Engenharia Nuclear, Programa de Pós-graduação em Ciências e Técnicas Nucleares, Av. Pres. Antônio Carlos 6627, Belo Horizonte MG, Brazil.
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Ha WH, Kim JK, Jin YW. Estimation of counting efficiencies of a portable NaI detector using Monte Carlo simulation for thyroid measurement following nuclear accidents. JOURNAL OF RADIOLOGICAL PROTECTION : OFFICIAL JOURNAL OF THE SOCIETY FOR RADIOLOGICAL PROTECTION 2017; 37:635-641. [PMID: 28474600 DOI: 10.1088/1361-6498/aa714d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Radioiodine can be released in nuclear accidents and can cause internal contamination of the thyroid gland in members of the public. For population monitoring in radiation emergencies, measurement of counting efficiency is very important to accurately determine thyroid activity. Here, we estimate the counting efficiencies of a portable NaI detector using Monte Carlo simulations. Two different types of neck phantoms and a 7.62 cm long by 7.62 cm diameter NaI detector were modeled and the counting efficiencies were calculated depending on the thyroid size and distance from the neck phantom to the detector. We found that distance is a more important parameter than thyroid size. The optimal distance of the NaI detector from the neck surface was determined to be greater than 12 cm, beyond which the counting efficiency was not affected by thyroid size.
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Affiliation(s)
- Wi-Ho Ha
- National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences, 75, Nowon-gil, Nowon-gu, Seoul, 01812, Korea. Department of Nuclear Engineering, Hanyang University, 222, Wangsimni-ro, Seondong-gu, Seoul, 04763, Korea
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Chen Y, Qiu R, Li C, Wu Z, Li J. Construction of Chinese adult male phantom library and its application in the virtual calibration ofin vivomeasurement. Phys Med Biol 2016; 61:2124-44. [DOI: 10.1088/0031-9155/61/5/2124] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Paiva FG, Oliveira AHD, Mendes BM, Pinto JR, Filho NDNA, Dantas BM, Dantas ALA, Silva TAD, Lacerda MADS, Fonseca TCF. Improvement of the WBC calibration of the Internal Dosimetry Laboratory of the CDTN/CNEN using the physical phantom BOMAB and MCNPX code. Appl Radiat Isot 2016; 117:123-127. [PMID: 26778764 DOI: 10.1016/j.apradiso.2015.12.059] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 12/23/2015] [Accepted: 12/29/2015] [Indexed: 10/22/2022]
Abstract
The Laboratory of Internal Dosimetry of the Center for Development of Nuclear Technology (LDI/CDTN) is responsible for routine internal monitoring of occupationally exposed individuals. The determination of photon emitting radionuclides in the human body requires calibration of the detector in specific counting geometries. The calibration process uses physical phantoms containing certified activities of the radionuclides of interest. The objective of this work was to obtain calibration efficiency curves of the Whole Body Counter in operation at the LDI/CDTN using a BOMAB physical phantom and Monte Carlo simulations.
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Affiliation(s)
- Fernanda Guerra Paiva
- Departamento de Engenharia Nuclear - Programa de Pós Graduação em Ciências e Técnicas Nucleares, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil
| | - Arno Heeren de Oliveira
- Departamento de Engenharia Nuclear - Programa de Pós Graduação em Ciências e Técnicas Nucleares, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil
| | - Bruno Melo Mendes
- Centro de Desenvolvimento da Tecnologia Nuclear - CDTN/CNEN, Av. Pres. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil
| | - Jacqueline Rosária Pinto
- Centro de Desenvolvimento da Tecnologia Nuclear - CDTN/CNEN, Av. Pres. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil
| | - Nelson do Nascimento A Filho
- Centro de Desenvolvimento da Tecnologia Nuclear - CDTN/CNEN, Av. Pres. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil
| | - Bernardo Maranhão Dantas
- Instituto de Radioproteção e Dosimetria - IRD/CNEN, Av. Salvador Allende s/n-Barra da Tijuca, 22783-127 Rio de Janeiro, RJ, Brazil
| | - Ana Letícia A Dantas
- Instituto de Radioproteção e Dosimetria - IRD/CNEN, Av. Salvador Allende s/n-Barra da Tijuca, 22783-127 Rio de Janeiro, RJ, Brazil
| | - Teógenes Augusto da Silva
- Programa de Pós Graduação do Centro de Desenvolvimento da Tecnologia Nuclear - CDTN/CNEN, Av. Pres. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG Brazil
| | - Marco Aurélio de Sousa Lacerda
- Programa de Pós Graduação do Centro de Desenvolvimento da Tecnologia Nuclear - CDTN/CNEN, Av. Pres. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG Brazil
| | - Telma Cristina Ferreira Fonseca
- Programa de Pós Graduação do Centro de Desenvolvimento da Tecnologia Nuclear - CDTN/CNEN, Av. Pres. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG Brazil.
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Fonseca TCF, Bogaerts R, Hunt J, Vanhavere F. A methodology to develop computational phantoms with adjustable posture for WBC calibration. Phys Med Biol 2014; 59:6811-25. [DOI: 10.1088/0031-9155/59/22/6811] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ferreira Fonseca TC, Bogaerts R, Lebacq AL, Ribeiro RM, Vanhavere F. MaMP and FeMP: computational mesh phantoms applied for studying the variation of WBC efficiency using a NaI(Tl) detector. JOURNAL OF RADIOLOGICAL PROTECTION : OFFICIAL JOURNAL OF THE SOCIETY FOR RADIOLOGICAL PROTECTION 2014; 34:529-543. [PMID: 24938683 DOI: 10.1088/0952-4746/34/3/529] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In a previous study, the counting efficiency calibration was calculated for 36 computational mesh phantoms called MaMP and FeMP-Male and Female Mesh Phantoms, which span variations in height, weight and gender. They were created to be used in a sitting configuration WBC set-up using an HPGe detector. Now this work is extended to investigate the influence of body sizes and the position of the detector on the counting efficiency (CE) for a different counting geometry. This was done by creating a new set of MaMP and FeMP mesh phantoms lying on a reclining chair and by studying the variation of the counting efficiency using a NaI(Tl) detector for the WBC set-up of SCK-CEN. The deviation of the CE due to the detector's position with respect to the phantom was investigated. Correlations were also studied for CE as a function of trunk volume, waist-hips ratio (WHR) and waist-chest ratio (WCR) for different mesh phantoms.
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Affiliation(s)
- T C Ferreira Fonseca
- Belgian Nuclear Research Centre (SCK•CEN), Rad. Prot. Dosimetry and Calibration, Boeretang, 200 Mol 2400, Belgium
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