1.放射線治療用電離箱線量計(放射線治療における線量測定法の諸問題 : 測定理論と臨床応用)

概要

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The ionization chamber dosimeter is now currently being used to measure absorbed dose during radiotherapy. In particular, the thimble-type ionization chamber is being widely used as a reference dosimeter and a field dosimeter. The new JARP(Japanese Association of Radiological Physicists)protocol gave definition of a JARP-type addressing which specified shape of thimble-type, and adapted a parallel plate-type ionization chamber to measure electron beams less than 10 MeV. Physical data and measurement theory have been replaced with newer ones so as to agree with the various other protocols. The handling of the ionization chamber differs depending on the ionization-type and radiation source to be measured, resulting in a complicated determination of correction factors such as correction is regarding the structure of the ionization chamber(A_c, A_w)correction for peturbation(P_d, P_f), and corrections for ion recombinaion(P_ion). With this trend, reliability regarding the measured value also becomes significantly important. This report deals with issues and data regarding measuring technology concerning the ionization chamber dosimeter to provide a reference for determining the correction factor using JARP protocol and the handling of this unit.
公益社団法人日本放射線技術学会の論文
1995-04-01