Developing the radium measurement system for the water Cherenkov detector of the Jiangmen Underground Neutrino Observatory
Developing the radium measurement system for the water Cherenkov detector of the Jiangmen Underground Neutrino Observatory
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DOI：
10.1016/j.nima.2020.164266
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发表时间：
2020-10
期刊：
影响因子：
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通讯作者：
Lifei Xie;J. Liu;S. Qiu;Cong Guo;Chang-gen Yang;Q. Tang;Yongpeng Zhang;Peng Zhang
中科院分区：
文献类型：
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作者：
Lifei Xie;J. Liu;S. Qiu;Cong Guo;Chang-gen Yang;Q. Tang;Yongpeng Zhang;Peng Zhang
摘要江门地下中微子天文台拟使用20千吨液体闪烁体探测器来确定中微子质量等级。对探测器的所有组件都提出了严格的放射性纯度要求。根据MC模拟结果，契伦科夫探测器水中溶解氡应在200 mBq/m3以下。氡的前身镭也应该得到认真考虑。为了测量水中的镭浓度，研制了一套由镭提取系统、氡射气室和氡浓度测量系统组成的镭测量系统。本文介绍了一天测量灵敏度为1.5mBq/m3的气体氡浓度测量系统的改进和灵敏度为1.23mBq/m3的水中镭浓度测量系统的研制情况以及大亚湾水样的测量结果。
Abstract The Jiangmen Underground Neutrino Observatory is proposed to determine neutrino mass hierarchy using a 20 ktonne liquid scintillator detector. Strict radio-purity requirements have been put forward for all the components of the detector. According to the MC simulation results, the radon dissolved in the water Cherenkov detector should be below 200 mBq/m 3. Radium, the progenitor of radon, should also be taken seriously into account. In order to measure the radium concentration in water, a radium measurement system, which consists of a radium extraction system, a radon emanation chamber and a radon concentration measurement system, has been developed. In this paper, the updated radon concentration in gas measurement system with a one-day-measurement sensitivity of∼ 5 mBq/m 3, the detail of the development of the radium concentration in water measurement system with a sensitivity of∼ 23 mBq/m 3 as well as the measurement results of Daya Bay water samples will be presented.