基于两种计算方法对15MV医用直线加速器机房进行辐射屏蔽分析

Radiation shielding analysis for 15 MV medical linear accelerator room by using two calculations

为医用直线加速器的屏蔽防护最优化设计提供参考依据,本文分别用9分值层法和蒙特卡罗方法对已知屏蔽墙外的辐射剂量率进行计算,并将计算结果与实际测量值进行对比分析,发现两种计算方法所测得的辐射剂量率值与测量值相对误差小于6%,由此得知两种计算方法均可以指导加速器机房辐射屏蔽设计,其中,蒙特卡罗方法误差相对较小,因此,在屏蔽机房设计时推荐使用蒙特卡罗方法。

To provide a reference for the optimal design of the shielding protection of medical linear accelerator, 9 points layer method and Monte Carlo method were respectively applied to calculate the radiation dose rate of the known shield wall. The calculated results and actual measurements were analyzed and compared. The comparative result showed the relative error between the result calculated by two methods and the measured result was less than 6%. The two calculations could guide the radiation shielding design of accelerator, and the Monte Carlo method is more favorable in the shielding room design for the smaller relative error.