Characterization of an extrapolation chamber in beta radiation beams and Monte Carlo modelling
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2020
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Radiation Physics and Chemistry
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At the Calibration Laboratory (LCI) of the IPEN/CNEN, studies are in development on the establishment of a
standard composed by the beta radiation sources for the dosimetry and calibration for personal monitoring in
Brazil. For this purpose is used the Böhm extrapolation chamber (PTW model 23392). This chamber was already
characterized at LCI in 90Sr/90Y beams using two different entrance windows: one of aluminized Mylar and
another of PET (polyethylene terephthalate) known as Hostaphan. In this work, this extrapolation chamber was
characterized in 85Kr and 147Pm beams. All tests were carried out with the reference 90Sr /90Y source, for
comparison purposes. The Monte Carlo code MCNP5 code was used to obtain an extrapolation chamber and the
BSS2 system sources computational model, based on the determination of the absorbed dose rate. Saturation
curves, ion collection efficiency, ion recombination, polarity effect, stability of response, null depth, linearity of
response, variation of response as a function of source-detector distance, extrapolation curves, correction factors
and absorbed dose rates were obtained. The difference between the experimental absorbed dose rates and those
obtained using the Monte Carlo model, compared to those from the calibration certificates, was less than 1.9%
for the 108 histories for each BSS2 system source. All results of the performed tests are within the limits of the
international recommendations. The results for the 90Sr/90Y source were in good agreement with previous works
performed at LCI. These results are suitable for the establishment of a standard instrument for the dosimetry and
calibration of beta radiation sources and detectors in the LCI/IPEN. This standard will allow the calibration of
detectors in beta radiation beams in dosimetry services in Brazil.
Como referenciar
POLO, IVON O.; SANTOS, WILLIAM S.; CALDAS, LINDA V.E. Characterization of an extrapolation chamber in beta radiation beams and Monte Carlo modelling. Radiation Physics and Chemistry, v. 171, p. 1-9, 2020. DOI: 10.1016/j.radphyschem.2020.108746. Disponível em: http://repositorio.ipen.br/handle/123456789/31423. Acesso em: 19 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.