MC法模拟与实验验证高气压电离室能量响应

MC Method Simulation and Experimental Verification of Energy Response of High Pressure Ionization Chamber

使用MCNP5对两个高气压电离室进行MC模拟,并完成实验测量,分别得到两个电离室的两种能量响应结果。将模拟结果与实验结果对比发现,两种结果在低能量段差异较大,两个电离室都在48 keV处相对偏差最大;在高能量段差异较小,1号电离室在1250 keV处相对偏差最大,2号电离室在662 keV处相对偏差最大;两种结果在164~1250 keV能量段的能量响应整体范围相近。最后分析发现在低能量段差异较大的主要原因是电离室的制造误差和模拟计算能量沉积时产生的计算误差。

MCNP5 is used to simulate the two high pressure ionization chambers,and the experimental measurements are completed.Two kinds of energy response results of the two ionization chambers are obtained respectively.Comparing the simulation results with the experimental results,it is found that the two results differ greatly in the low energy range,and the relative deviation of the two ionization chambers is the largest at 48 keV;In the high energy range,the difference is small.The relative deviation of No.1 ionization chamber is the largest at 1250 keV,and that of No.2 ionization chamber is the largest at662 keV;The energy response of the two results in the energy range of 164 keV to 1250 keV is similar.Finally,it is found that the main reasons for the large difference in the low energy range are the manufacturing error of the ionization chamber and the calculation error generated in the simulation calculation of energy deposition.