コバルト外照射に於ける組織欠損と斜入射の補償

概要

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The dose distribution is affected by irregular body contours and oblique beam incidence. In above conditions depth dose rates were measured with the paraffin wax filter to compensate tissue deficit. The thickness of this filter (compensator) to compensate for reduction in scattered radiation were determined for mounting distance of compensator 30 cm. The thickness ratios of compensator needed to absorbed the same amount of radiation as a given thickness of tissue deficit were respectively 0.76,0.60 and 0.60 for field size 5×5,10×10 and 15×15cm^2. The results obtained are as follows : 1) If the compensating filter is used, the dose rates on a central axis agree within ±2%. 2) The dose rates on a central and off axis for oblique beam incidence agree within ±3%.
公益社団法人日本放射線技術学会の論文
1980-09-01