Determination of true null electrode spacing of an extrapolation chamber for x-ray dosimetry

8th Brazilian Congress on Metrology

Figueiredo, M.T.T.^1 ; Bastos, F.M.^1 ; Da Silva, T.A.^1

Centro de Desenvolvimento da Tecnologia Nuclear, CDTN, Belo Horizonte, Brazil^1

关键词: Absorbed dose;    Critical analysis;    Electrode spacing;    Extrapolation chamber;    Measurement methods;    Sensitive volume;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/733/1/012093/pdf
DOI  :  10.1088/1742-6596/733/1/012093

来源: IOP

【 摘 要 】

An accurate determination of the true null distance between electrodes, that defines the sensitive volume of an extrapolation chamber, is critical for the establishment of a primary measurement method for absorbed dose in tissue. In this work, a critical analysis of two methodologies for determining the true null electrode spacing of a 23392 Böhm model PTW extrapolation chamber was done.