Monte Carlo法を用いた体内散乱線の解析 : ^<60>Co照射時の2次電子スペクトル

概要

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The Monte Carlo computer program has been used to analyze the characteristics of scattered radiation in a phantom irradiated by cobalt 60 gamma rays. The program simulated an irradiation by 1250 keV photon with a 0 area field upon a center of a 30 × 30 cm water phantom. The study distinguished energy distributions of the secondary electron which were set in motion by interactions in the ring with radius R and depth d. Based on this result, spectrums of the secondary electron on the beam axis of circular fields were calculated, and the relative value of conversion factor Cλ was obtained. On this analysis, it was found that conversion factor Cλ on the beam axis tended to become a large value with a field radius and depth from entrance surface. However, at the region near the exit surface, this tendency was reversed regarding its relation with depth. For precise measurements and calculations of high energy radiation, this correction for Cλ based on the secondary electron spectrums should be carried out.
公益社団法人日本放射線技術学会の論文
1987-01-01