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Counting Radio-Krypton Atoms with a Laser
Guo-min Yang,Le-yi Tu,Cun-feng Cheng,Xiang-yang Zhang,Shui-ming Hu*
Author NameAffiliationE-mail
Guo-min Yang Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China  
Le-yi Tu Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China  
Cun-feng Cheng Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China  
Xiang-yang Zhang Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, ChinaInstitute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China  
Shui-ming Hu* Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China smhu@ustc.edu.cn 
Abstract:
Because of their unique chemical and physical properties, long-lived rare krypton radioisotopes, 85Kr and 81Kr, are ideal tracers for environmental samples, including air, groundwater and ice. Atom trap trace analysis (ATTA) is a new laser-based method for counting both 85Kr and 81Kr atoms with the abundance as low as 10-14 with micro-liters (STP) krypton gas. The entire system for rare radio-krypton measurement built at Hefei is presented, including the atom trap trace analysis instrument and sampling apparatus of gas extraction from water and krypton purification. Atmospheric85Kr concentrations at different places in China were measured, showing a range of 1.3-1.6 Bq/m3, consistent with the northern hemispheric baseline. As a demonstration of the system, some shallow and deep groundwater samples in north and south China were sampled and dated.
Key words:  Atom trap trace analysis, 85Kr, 81Kr, Groundwater, Dating
FundProject:
用激光计数放射性氪原子
杨国民,涂乐义,程存峰,张向阳,胡水明*
摘要:
原子阱痕量分析是一种基于激光的新方法,能够对数微升氪气中丰度低至10-1485Kr和81Kr原子进行计数测量.介绍了在合肥建成的痕量放射性氪同位素测量系统,包括ATTA装置、水中溶解气提取和氪气分离提纯的样品处理设备.利用该系统对国内多处大气中85Kr浓度的测量结果为1.3~1.6 Bq/m3,与文献中北半球大气本底值相吻合.对华南和华北的几个浅层和深层地下水样品进行了85Kr和81Kr测年,示范了该系统的应用.
关键词:  原子阱痕量分析,85Kr,81Kr,地下水,测年
DOI:10.1063/1674-0068/28/cjcp1505108
分类号: