60-2614keV能区同轴锗探测器效率曲线半经验拟合表达式的研究

Study of Semi-Empirical Fits to the Efficiency Curves of Coaxial Germanium Detectors in Energy Range of 60～2614 keV

作者研究了两类关于同轴锗探测器全能峰效率曲线的拟合公式.这两类公式对拟合参数都是线性的,都是由γ射线与物质相互作用过程(光电吸收、康普顿散射和电子对产生)的几率随入射γ射线能量的变化关系的渐近表达式中的若干项合并调整而得到的.两类公式都能够在很宽的能区上很好地拟合同轴锗探测器对点源、面源和圆柱体源的全能峰效率曲线.

In this paper, two equations which can be used to fit the efficiency curves of coaxial Germanium detectors are introduced. Both equations are linear with respect to the fitting parameters. They were obtained by combining, and minor adjusting, the terms in the asymptotic expressions for the probabilities of the processes （photoelectric absorption, Compton scattering and pair production） through which y-rays interact with matter. Both equations were found to be able to fit very well in wide energy ranges the efficiency curves of coaxial Ge detectors detecting y-rays from point or plane sources, as well as from cylindrical volume sources.