A Comparison of Activity Analysis of γ Radionuclides in Water
YANG Zhi-jie1,2,LIU Hao-ran2,LIANG Jun-cheng2,ZHU Da-bin3,WANG Nan-ping1
1. China University of Geosciences, Beijing 100083, China
2. National Institute of Metrology, Beijing 100029, China
3. Suzhou Nuclear Power Research Institute, Suzhou, Jiangsu 215004, China
Abstract：In order to examine the accuracy and consistency of measurement results in measurement laboratories, measurement comparison had been organized to measure the same sample with the same properties between multiple laboratories. After the comparison, a full-factor check for levels of the measuring instruments, measuring personnel, operating procedures and daily quality control of each participating laboratory had been achieved. From 2017 to 2018, the comparison of radioactivty analysis of the gamma radionuclides in the water of China General Nuclear Power Group was organized and implemented. 15 laboratories from 6 major nuclear power bases participated in the comparison, and submitted 23 comparison results. The data were analyzed according to the relative deviation comparison method, En evaluation method and the Z-scores method. Finally, in order to compare the advantages and disadvantages of the comparison results, combined with the special situation in the field of nuclear power, the eligibility of the comparison results had been distinguished based on the En evaluation and Z-scores comprehensive evaluation method. Based on the evaluation criteria, the pass rate of the nuclide 57Co, 137Cs and 241Am is 95.7%; the pass rate of the nuclide 109Cd and 60Co is 91.3%.
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2019, Vol. 40 
