Experimental apparatus for measurement of photoneutrons from linear accelerator with energy of 16 MeV

Marcelo Vilela da Silva; Domingos D'Oliveira Cardoso; Sergio de Oliveira Vellozo

doi:10.15392/bjrs.v9i3.1615

Authors

Marcelo Vilela da Silva UNIVERSIDADE FEDERAL DO RIO DE JANEIRO
Domingos D'Oliveira Cardoso INSTITUTO MILITAR DE ENGENHARIA
Sergio de Oliveira Vellozo INSTITUTO MILITAR DE ENGENHARIA

DOI:

https://doi.org/10.15392/bjrs.v9i3.1615

Keywords:

Particle accelerator, Experimental apparatus, Neutron detectors.

Abstract

Particle accelerator technology has a deep impact on society. Its applications are well established mainly in the treatment of cancer and other diseases. This work aims to develop an experimental apparatus with ³He detectors for 16 MeV photoneutron measurements. The apparatus allows us to obtain multienergetic neutrons with the use of a 22 cm diameter spherical attenuator associated with different shield thicknesses. The microscopic processes of the fast and thermal neutrons in the detector were described by the two energy-group diffusion equation. The Detector Response Dose Rate results show a directly proportional relationship between these two variables with a degree of reliability attested by the linear correlation coefficient .Particle accelerator technology has a deep impact on society. Its applications are well established mainly in the treatment of cancer and other diseases. This work aims to develop an experimental apparatus with ³He detectors for 16 MeV photoneutron measurements. The apparatus allows us to obtain multienergetic neutrons with the use of a 22 cm diameter spherical attenuator associated with different shield thicknesses. The microscopic processes of the fast and thermal neutrons in the detector were described by the two energy-group diffusion equation. The Detector Response Dose Rate results show a directly proportional relationship between these two variables with a degree of reliability attested by the linear correlation coefficient .

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References

UNSCEAR - United Nations Scientific Committee on the Effects of Atomic Radiation Sources and effects of ionizing radiation. Report to the General Assembly, with scientific annexes. Volume I: Report to the General Assembly, Scientific Annexes A and B. 2008.

MORTON, G.C., et al., Health-related quality of life after single-fraction high-dose-rate brachytherapy and hypofractionated external beam radiotherapy for prostate cancer. In-ternational Journal of Radiation Oncology Biology Physics, 2011.80(5): p. 1299-1305.

PERES, L., Radiação ionizante: princípios físicos, aplicações e riscos.1a ed. CELD. 2008.

ZHANG, X., et al., A methodology for automatic intensity-modulated radiation treatment planning for lung cancer. Physics in Medicine and Biology, 2011.56(13): p. 3873-3893.

REBELLO, W. F., Blindagem para proteção de pacientes contra nêutrons gerados nos aceleradores lineares utilizados em radioterapia. 2008. 78 p. Tese (Doutorado em Ciências) - Universidade Federal do Rio de Janeiro, Programa de Pós-graduação de Engenharia Nuclear, COPPE, 2008.

National Council on Radiation Protection and Measurements. “Neutron contamination from medical accelerators”. Bethesda, MD: NCRP Report. nº 79; 1984.

FACURE, A.N.S.S., Doses ocupacionais devido a nêutrons em salas de aceleradores lineares de uso médico. 2006. 125 p. Tese (Doutorado em Ciências) - Universidade Federal do Rio de Janeiro, Programa de Pós-graduação de Engenharia Nuclear, COPPE, 2006.

ZAMBONI, C.B., 2007, Fundamentos da Física de Nêutrons, 1 ed., São Paulo, Editora Livraria da Física.

SALGADO, A. P., Avaliação da resposta dos monitores de área para nêutrons em campo de radiação gerado por um acelerador clínico de 15 MV. 2011. 58 p. Dissertação (mestrado) – Instituto de Radioproteção e Dosimetria, 2011.

DUDERSTADT, J. J., HAMILTON, L.J., Nuclear Reactor Analysis. Wiley, 1976.

SILVA. M.V., Proposta de aparato experimental para caracterização da resposta de detectores de 3He, para medida de fotonêutrons gerados em aceleradores com energia acima de 8 MV. 2016. 77 P. Dissertação (Mestrado Nuclear) – Instituto Militar de Engenharia, Rio de Janeiro, 2016.

ICRU. ICRU Report 83: Prescribing Recording and Reporting Photon-Beam Intensity-Modulated Radiation Therapy (IMRT). Oxford University Press. Journal of the ICRU. 2010;10(1):17-38.

THALHOFER, J.L., Cálculo de Doses em Órgãos Sadios no Tratamento Radioterápico para Próstata, Utilizando Modelagem Computacional e Fantoma em Voxel. 2011. 83 p. Dissertação (Mestrado em Ciências) - Instituto Militar de Engenharia, Seção de Engenharia Nuclear, 2011.