治療用電子ビームの特性 : アプリケータの影響

概要

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Effect of a variable collimator and eight cones on electron beam parameters is reported. Depth-ionization curves are measured for electron beams (nominal 4, 6, 8, 10, 12 and 14 MeV each) produced with a microtron in which one of the 8 cones or the variable collimator is installed. Leakage radiation through the variable collimator is also measured. The peak absorbed dose takes influence of the structure of the cone installed, and shows discontinuous change with the radiation field size. On the other hand, the depth of 80% doesn't. When the variable collimator is installed, both the peak absorbed dose and the depth of 80% dose change continuously with the radiation field size. Relation between the cone structure and the amount of the scattered electrons is also discussed. The results are applicable to the design and the assessment of applicators in which the amount of the scattered electrons is controlled.
社団法人日本放射線技術学会の論文
1992-05-01