Monte Carlo法を用いた体内散乱線の解析 : 各次散乱線成分の相対比

概要

論文の詳細を見る
A Monte Carlo computer program has been used to analyze the characteristics of each order of scattered radiation in a phantom irradiated by <60>^Coγ-rays and 10 MV X-rays. The program simulated an irradiation with a pencil beam upon a center of 30×30×30 cm water phantom and calculated the primary doses and each order of scattered doses on the beam axis of circular fields from the simulation data. Relative fraction of first scattered doses to full scattered doses did not change so much with a change in depth, and could be approximated as a function of field radius only. When full scattered doses, which calculated by this approximating equation using first scattered doses, were used on the correcting equation of an inhomogeneous medium, the correction factors deviated from that calculated using the true value of full scattered dose with less than I percent on average. Using this approximating equation, the inhomogeneous correction factors, which take in account of full scattered doses, could be calculated briefly by means of the first scattered doses.
公益社団法人日本放射線技術学会の論文
1988-10-01