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Efficient Separation of Ar and Kr from Environmental Samples for Trace Radioactive Noble Gas Detection
Le-yi Tu,Guo-min Yang,Xiang-yang Zhang,Shui-ming Hu
Author NameAffiliationE-mail
Le-yi Tu Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China  
Guo-min Yang 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, China;Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Zhengding 050803, 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:
Radioactive noble-gas isotopes, 85Kr (half-life t1/2=10.8 y), 39Ar (t1/2=269 y), and 81Kr (t1/2=229,000 y), are ideal tracers and can be detected by atom trap trace analysis (ATTA), a laser-based technique, from environmental samples like air and groundwater. Prior to ATTA measurements, it is necessary to efficiently extract krypton and argon gases from samples. Using a combination of cryogenic distillation, titanium chemical reaction and gas chromatography, we demonstrate that we can recover both krypton and argon gases from 1-10 L "air-like" samples with yields in excess of 90% and 98%, respectively, which meet well the requirements for ATTA measurements. A group of testing samples are analyzed to verify the performance of the system, including two groundwater samples obtained from north China plain.
Key words:  Atom trap trace analysis  Gas chromatography  Radioactive noble gas
FundProject:
从环境样品中分离氩气和氪气用于放射性惰性气体探测
涂乐义,杨国民,张向阳,胡水明
摘要:
放射性惰性气体同位素85Kr(半衰期为10.8年)、39Ar(半衰期为269年)和81Kr(半衰期为22.9万年)是理想的环境示踪剂,基于激光技术的原子阱痕量分析方法(Atom trap trace analysis, ATTA)可以实现对空气、地下水等环境样品中这几种同位素的有效探测. 在进行ATTA测量之前,需要将样品中的氪气和氩气有效分离出来. 利用低温蒸馏、海绵钛化学吸附和气相色谱分离等技术,可以从1~10 L气体样品中分别提取出90%以上的氪气和98%以上的氩气,从而满足ATTA测量的样品要求. 通过对包括两个野外地下水样品等一系列样品进行分离实验,验证了气体分离装置的可靠性能.
关键词:  原子阱痕量分析  气相色谱分离  放射性惰性气体
DOI:10.1063/1674-0068/29/cjcp1510210
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