基于MCNP的快速计算γ射线质量衰减系数的方法研究

Method study on rapidly calculating γ-ray mass attenuation coefficient based on MCNP

为了便捷地得到γ射线在各类材料中的质量衰减系数,提出了一种基于MCNP程序的快速准确计算γ射线质量衰减系数的方法,并通过比较模拟计算值与理论计算值,验证了计算方法的正确性。在此基础上,计算了γ射线在某系列铅硼聚乙烯中的质量衰减系数,并与公式计算值以及实验值进行了比较。同时,对穿透性能比较差的低能γ射线在铅中的质量衰减系数进行了计算,并将计算结果与相关标准中的数据进行了比较,结果符合较好。这表明该方法能为γ射线在现有材料中质量衰减系数的补充以及在新材料中质量衰减系数的确定提供一定的参考。

In order to obtain theγ-ray mass attenuation coefficient in various types of materials conveniently,a method based on MCNP program for rapidly and accurately calculating theγ-ray mass attenuation coefficient is proposed.By comparing the simulated and theoretical calculation values,the correctness of the calculation method is verified.On this basis,the mass attenuation coefficient ofγ-rays in a certain series of lead-boron-polyethylene is simulated and compared with the calculated and experimental values.At the same time,the mass attenuation coefficient of low-energyγ-rays with poor penetration performance in lead is simulated and compared with the data in related standards.The results are all in good agreement,which indicates that the method can provide a reference for the complementarity ofγ-ray mass attenuation coefficient in the existing material and the determination ofγ-ray mass attenuation coefficient in the new material.