Application of the correction factor for radiation quality Kq in dosimetry with pencil-type ionization chambers using a tandem system
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2017
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INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE
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Resumo
The pencil-type ionization chamber widely used in computed tomography (CT) dosimetry, is a measuring
instrument that has a cylindrical shape and provides uniform response independent of the angle of incidence of
ionizing radiation. Calibration and measurements performed with the pencil-type ionization chamber are done in
terms of Kerma product in air-length (Pk,l) and values are given in Gy.cm. To obtain the values of (Pk,l) during
clinical measurements, the readings performed with the ionization chamber are multiplied by the calibration
coefficient (Nk,l) and the correction factor C for quality (Kq) which are given in Calibration certificates of the
chambers. The application of the correction factor for radiation quality Kq is done as a function of the effective
energy of the beam that is determined by the Half Value layer (HVL) calculation. In order to estimate the HVL
values in this work, a Tandem system made up of cylindrical aluminum and PMMA absorber layers was used as
a low cost and easy to apply method. From the Tandem curve, it was possible to construct the calibration curve
and obtain the appropriate Kq to the beam of the computed tomography equipment studied.
Como referenciar
FONTES, LADYJANE P.; POTIENS, MARIA da P.A. Application of the correction factor for radiation quality Kq in dosimetry with pencil-type ionization chambers using a tandem system. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 22-27, 2017, Belo Horizonte, MG. Proceedings... Rio de Janeiro, RJ: Associação Brasileira de Energia Nuclear, 2017. Disponível em: http://repositorio.ipen.br/handle/123456789/28232. Acesso em: 30 Dec 2025.
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.