Research on α/β Rays Discrimination Method Based on Digital Pulse Processor

被引：0
|
作者：
Duan Z. [1 ,2 ]
Li J. [1 ]
Hu R. [3 ]
Xiao M. [3 ]
机构：
[1] Department of Engineering Physics, Tsinghua University, Beijing
[2] Unit 92609, Beijing
[3] CGN Jiuyuan(Chengdu) Science and Technology Co., Ltd., Chengdu
来源：
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | 2021年 / 55卷 / 08期
关键词：
Particle discrimination; Phoswich detector; Α/β; measurement;
D O I：
10.7538/yzk.2020.youxian.0622
中图分类号：
学科分类号：
摘要：
Most of the surface contamination detection equipments use a phoswich detector composed of ZnS(Ag) and plastic scintillators to simultaneously measure α/β rays, and the discrimination method of α/β rays is critical in this process. The traditional discrimination methods are pulse amplitude discrimination and pulse width discrimination, and the parameter setting of the analog components has a great impact on the stability of the discrimination. In this paper, a digital pulse processor is used to screen α/β rays. A current restorer, a double-channel box filter and a ratio calculator inside the FPGA were constructed to calculate the ratio output peaks of the double-channel box filter. The α/β rays are Gaussian in different intervals in the ratio statistical graph, thus the α/β rays can be discriminated. The results show that this discrimination method can discriminate α/β rays in real time, with the quality factor of 3.52 and crosstalk ratio of less than 0.5%. The detection efficiency for α and β rays is respectively no less than 57.7% and 37%. © 2021, Editorial Board of Atomic Energy Science and Technology. All right reserved.
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页码：1478 / 1484
页数：6
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