用Monte-Carlo方法计算正电子湮没寿命谱中的衬底效应

Application of Monte-Carlo method to calculate the substrate effect in the lifetime spectrum of positron annihilation

用Monte－Carlo方法模拟计算了22Na源的正电子在不同厚度Mylar膜、Ni膜衬底中的湮没几率，得出Si、Fe、PE、PP4种样品在不同Mylar膜厚度下的衬底效应。结果显示，对PE、PP样品衬底效应较Si、Fe等样品强。表明用Monte－Carlo方法计算衬底效应是可行的。

Monte-Carlo method was applied to calculate the annihilation probabilities ofpositrons from 22Na in Mylar and Ni films with different thickness. Results ofsubstrate effects of Mylar films with different thickness for sample of Si, Fe, PE andPP were obtained. The results showed that the substrate effects for samples PE andPP were stronger than those for Si and Fe. Therefore it is feasible for usingMonte-Carlo method to calculate substrate effect.