Monte Carlo法を用いた体内散乱線の解析 : 10 MV X線の散乱-1次線量比

概要

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A Monte Carlo computer program was used to analyze the characteristics of scattered radiation in a phantom irradiated by 10 MV X-rays. The program simulated an irradiation by 10 MV X-ray with 0 area field upon the center of a 30×30×30 cm water phantom, and scored energy imparted on the beam axis by interactions of primary photons (primary dose) and energy imparted in the rings, with radius R and depth d, by interactions of scattered photons. The dose on the beam axis for circular fields due to scattered radiation (scatter dose) were calculated from energy imparted data for these rings by means of the superposition principle. Scatter-primary dose ratios at the reference depth were calculated from the primary dose and scatter dose data, and these ratios did not fluctuate beyond 0.3% for some fluctuations of electron accelerated energy, etc. Tissue-primary dose ratio and Scatter-primary dose ratio data for each depth were calculated from the Scatter-Primary dose ratio data at the reference depth and the standard data of percentage depth dose.
公益社団法人日本放射線技術学会の論文
1988-01-01