Efficiency Calibration of Reactor Noble Gas Monitor Using Radioactive Simulated Gas Standard Source

被引：0

作者：

Guo X. ^{[1
]}

Rong Y. ^{[2
]}

Yang Q. ^{[1
]}

Diao L. ^{[1
]}

Lin M. ^{[1
]}

Yao S. ^{[1
]}

机构：

[1] National Key Laboratory for Metrology and Calibration, China Institute of Atomic Energy, Beijing

[2] Department of Reactor Engineering Technology, China Institute of Atomic Energy, Beijing

来源：

Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | 2019年 / 53卷 / 06期

关键词：

Expandable polystyrene; Gamma ray full energy peak efficiency; HPGe detector; Marinelli-beaker simulated gas standard source;

D O I：

10.7538/yzk.2018.youxian.0533

中图分类号：

学科分类号：

摘要：

In order to accurately calibrate the gamma ray full energy peak efficiency of the noble gas monitor to the gas source, a Marinelli-beaker radioactive simulated gas standard source with expandable polystyrene (EPS) particles as the matrix material was prepared. The sample density of the simulated gas source is 4.1 kg/m3, which contains eight kinds of single energy γ-ray emission nuclides, including 241Am, 109Cd, 57Co, 51Cr and so on. Using the simulated gas standard source, the gamma ray full energy peak efficiency of HPGe detector in the reactor noble gas field monitor was calibrated. The calibration energy region is 60-1 836 keV, and the maximum standard uncertainty of calibration efficiency is 4.4%. At the same time, a point source at a representative point method was used to calibrate the efficiency, and the calibration results of the simulated gas source and the point source at the representative position were compared. It is found that the efficiency ratio between the simulated gas source and the point source at the representative position is not a constant in the calibration energy region, and the maximum efficiency deviation is up to 28%. The deviation can be reduced by efficiency transfer coefficient and the fitting curve of efficiency transfer coefficient can be obtained. Finally, at the 81 keV energy point, the efficiency ratio of 1.26 is obtained between the simulated gas standard source and the practice gas standard source, which can be used as a reference for the practical application of the simulated gas standard source. © 2019, Editorial Board of Atomic Energy Science and Technology. All right reserved.

引用

页码：1098 / 1104

页数：6

共 16 条

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