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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*
作者单位E-mail
杨国民 中国科学技术大学合肥微尺度物质国家实验室合肥230026  
涂乐义 中国科学技术大学合肥微尺度物质国家实验室合肥230026  
程存峰 中国科学技术大学合肥微尺度物质国家实验室合肥230026  
张向阳 中国科学技术大学合肥微尺度物质国家实验室合肥230026中国地质科学院水文地质环境地质研究所石家庄050061  
胡水明* 中国科学技术大学合肥微尺度物质国家实验室合肥230026 smhu@ustc.edu.cn 
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:
基金项目:
Counting Radio-Krypton Atoms with a Laser
Guo-min Yang,Le-yi Tu,Cun-feng Cheng,Xiang-yang Zhang,Shui-ming Hu*
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