Determination of gross α and β activities in Zouma River based on online HPGe gamma measurement system  

作　　者：Xian Guan Liang-Quan Ge Guo-Qiang Zeng Xiao-Qin Deng Li-Peng Xu Sheng-Liang Guo 

机构地区：[1]Key Laboratory of Applied Nuclear Techniques in Geosciences of Sichuan Province,Chengdu University of Technology,Chengdu 610059,China [2]Sichuan Management&Monitoring Center Station of Radioactive Environment,Chengdu 610031,China [3]Chengdu New Nuclear Tyco Technology Co.,Ltd,Chengdu 610052,China

出　　处：《Nuclear Science and Techniques》2020年第12期65-76,共12页核技术（英文）

基　　金：the National Science Foundation of China(No.41774147);the National Key R&D Program of China(No.2017YFC0602105);the Science–Technology Support Plan Projects of Sichuan Province(No.2020YJ0334);the Sichuan Science and Technology Program(No.2020JDRC0108).

摘　　要：This paper describes a low-cost and fast method to evaluate gross α and β^(-) radioactivities in natural water based on an online high-purity germanium detector gamma measurement system.The major gamma activities in natural water are provided by natural and artificial radionuclides such as ^(40) K,^(137)Cs,and radionuclides belonging to ^(238)U and ^(232)Th series.The main a emitters related to gamma emissions in natural water are ^(224)Ra(240.98 keV)and ^(226)Ra(186.21 keV),and the β^(-) emitters are ^(40) K(1460.85 keV),^(214)Bi(609.31 keV),^(208)Tl(583.19 keV),and ^(214)Pb(351.93 keV).The formula for gross α and β^(-) activity concentration is based on these radionuclides,and the short half-life decay products are considered in the calculation.The detection efficiency of the device across energy region(0–3 MeV)is obtained through Monte Carlo simulation,and a calibration experiment is conducted to verify the simulation results.Gamma radioactivity is measured continuously for 114 d in Pixian County and Dongfeng Canal located in the Zouma River,Chengdu,Sichuan Province,China.A comparison of the calculation results and monitoring data from the Sichuan Management and Monitoring Center Station of Radioactive Environment indicates that the percentage and absolute error of a activity concentration is lower than 53%and 0.02 Bq/L,respectively,and that of β-activity concentration is lower than 33.2%and 0.016 Bq/L,respectively.The method can rapidly determine gross α and β^(-) activity concentrations in natural water online.

关 键 词：Grossαandβ^(-)activity HPGe gamma spectrometer Online radioactivity level measurement for natural water Natural radioactivity Water sources of Chengdu 

分 类 号：TL81[核科学技术—核技术及应用]