Research on Coincidence Detection Efficiency Based on Positron Decay Nuclides

Zhuo Xianglin; Qing Xianguo; Yang Zhenlei; Bao Chao; Jiang Tianzhi; Li Jin; Lu Jiawei

doi:10.13832/j.jnpe.2024.01.0246

Volume 45 Issue 1

Feb. 2024

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Article Navigation > Nuclear Power Engineering > 2024 > 45(1): 246-252

Zhuo Xianglin, Qing Xianguo, Yang Zhenlei, Bao Chao, Jiang Tianzhi, Li Jin, Lu Jiawei. Research on Coincidence Detection Efficiency Based on Positron Decay Nuclides[J]. Nuclear Power Engineering, 2024, 45(1): 246-252. doi: 10.13832/j.jnpe.2024.01.0246

Citation:

Zhuo Xianglin, Qing Xianguo, Yang Zhenlei, Bao Chao, Jiang Tianzhi, Li Jin, Lu Jiawei. Research on Coincidence Detection Efficiency Based on Positron Decay Nuclides[J]. Nuclear Power Engineering, 2024, 45(1): 246-252. doi: 10.13832/j.jnpe.2024.01.0246

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Research on Coincidence Detection Efficiency Based on Positron Decay Nuclides

doi: 10.13832/j.jnpe.2024.01.0246

Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China

Received Date: 2023-04-17
Rev Recd Date: 2023-06-12
Publish Date: 2024-02-15

Abstract

Abstract

In order to reduce the measurement lower limit of the primary pressure boundary leakage monitoring, the coincidence detection efficiency based on positron decay nuclides has been studied. In order to improve the coincidence detection efficiency, the particle transport process in the coincidence detection device has been simulated and analyzed by Monte Carlo code Geant4, and the effects of coincidence detection device structure and detector properties on the coincidence detection efficiency have been studied. The research results show that: adding β⁺ absorbing layers on both sides of the filter paper can significantly improve the coincidence detection efficiency, and the optimal coincidence detection efficiency is obtained when 0.5mm Al or 0.2mm Fe is used as β⁺ absorbing layer; due to the difference in energy resolution of different types of detectors, different types of detectors have different energy window coefficients for reaching the optimal detection efficiency. The optimal energy window coefficients of NaI(Tl), BGO and LaBr₃(Ce) are 14%, 26% and 7% respectively. The results of this research can provide a reference for the structural design of the detection device and the coincidence judgment logical design of the primary pressure boundary leakage monitoring system with ¹⁸F nuclide as the radioactive tracer.
- Primary pressure boundary leakage monitoring,
- Coincidence detection efficiency,
- Scintillator detector,
- Positron source,
- Geant4

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References(18)

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