Modification of source contribution in PALS by simulation using Geant4 code
Modification of source contribution in PALS by simulation using Geant4 code
复制标题
通过使用 Geant4 代码进行模拟来修改 PALS 中的源贡献
DOI：
10.1016/j.nimb.2017.02.038
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发表时间：
2017-04-15
影响因子：
1.3
通讯作者：
Wei, Long
中科院分区：
文献类型：
--
作者：
Ning, Xia;Cao, Xingzhong;Wei, Long
The contribution of positron source for the results of a positron annihilation lifetime spectrum (PALS) is simulated using Geant4 code. The geometrical structure of PALS measurement system is a sandwich structure: the Na-22 radiation source is encapsulated by Kapton films, and the specimens are attached on the outside of the films. The probabilities of a positron being annihilated in the films, annihilated in the targets, and the effect of positrons reflected back from the specimen surface, are simulated. The probability of a positron annihilated in the film is related to the species of targets and the source film thickness. The simulation result is in reasonable agreement with the available experimental data. Thus, modification of the source contribution calculated by Geant4 is viable, and it beneficial for the analysis of the results of PALS. (C) 2017 Elsevier B.V. All rights reserved.
