化合物或混合物的有效原子序数研究

Atudy on the Effective Atomic Number of Compounds and Mixtures

采用美国国家标准与技术研究所(NIST)提供的150～1 000 keV入射X、γ射线与1-92号元素相互作用的线性衰减系数值作为研究对象,对X、γ射线与物质相互作用的计算公式(7)进行分析和研究,对公式中涉及的光电效应相关参数进行修正,基本实现了150～1 000 keV能量范围内,1-92号元素的各能量值的线性衰减系数的近似计算,误差在2%以内。对化合物或混合物的有效原子序数计算公式(2)相关参数进行修正,计算结果误差在1%以内。

Based on the data of NIST, investigations to the linear attenuation coefficient are given for the 150 - 1000 keV photon in the interaction with the element with Z from 1 to 92. The parameters of the formula （7） in the attenuation coefficient caused by the photoemission effect are modified. The modified linear attenuation coefficients are in good agreement with the NIST data. All the errors are below two percent. The parameters of the formula （2） in the effective atomic number of the compound and the mixture are also modified by present work. All the errors are below two percent.