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便携式γ谱仪对137Cs、131I液样探测效率的刻度
引用本文:闫学昆,张燕,李洋,罗明. 便携式γ谱仪对137Cs、131I液样探测效率的刻度[J]. 原子能科学技术, 2018, 52(7): 1341-1344. DOI: 10.7538/yzk.2017.youxian.0614
作者姓名:闫学昆  张燕  李洋  罗明
作者单位:中国人民解放军92609部队,北京100077
摘    要:便携式γ谱仪主要用于主冷却剂水样中典型核素的现场辅助识别及其活度浓度的测量分析。为确定典型核素特征峰净面积和水样中该核素活度浓度的关系,必须进行源峰效率刻度。本文通过测量133Ba、137Cs、60Co 3种核素的混合溶液得到效率刻度曲线,然后对不同活度浓度的137Cs标准溶液、131I标准模拟溶液进行测量。结果表明,谱仪均能正确识别137Cs、131I核素,活度浓度测量的相对误差均<10%,初步满足元件破损监测精度和灵敏度的需求。

关 键 词:便携式&gamma   谱仪   元件破损监测   典型核素   效率刻度

Detection Efficiency Calibration of Portable γ Spectrometer for 137Cs and 131I Solution Samples
YAN Xuekun,ZHANG Yan,LI Yang,LUO Ming. Detection Efficiency Calibration of Portable γ Spectrometer for 137Cs and 131I Solution Samples[J]. Atomic Energy Science and Technology, 2018, 52(7): 1341-1344. DOI: 10.7538/yzk.2017.youxian.0614
Authors:YAN Xuekun  ZHANG Yan  LI Yang  LUO Ming
Affiliation:Unit 92609 of the PLA, Beijing 100077, China
Abstract:The portable γ spectrometer can be used for identification of typical nuclides in the primary coolant and acquiring their activity concentrations in situ. The source-peak efficiency should be calibrated to ascertain the relationship between the net area under the characteristic peak of typical nuclide and its genuine activity concentration in the water sample. The efficiency calibration curve was acquired by measuring the mixed solution of 133Ba, 137Cs and 60Co nuclides, and then 137Cs standard liquid and simulated 131I standard liquid were measured respectively. Test results indicate that the spectrometer can identify typical nuclides 137Cs and 131I, and the measuring relative error of activity concentration is less than 10%, which satisfies the requirement of measurement accuracy and sensitivity for fuel element rupture detection.
Keywords:portable γspectrometer  fuel element rupture detection  typical nuclide  efficiency calibration
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