Analysis of Krypton-85 and Krypton-81 in a Few Liters of Air

被引：19
作者：
Tu, Le-Yi [1 ]
Yang, Guo-Min [1 ]
Cheng, Cun-Feng [1 ]
Liu, Gu-Liang [1 ]
Zhang, Xiang-Yang [2 ]
Hu, Shui-Ming [1 ]
机构：
[1] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China
[2] Chinese Acad Geol Sci, Inst Hydrogeol & Environm Geol, Zhengding 050803, Hebei Province, Peoples R China
来源：
ANALYTICAL CHEMISTRY | 2014年 / 86卷 / 08期
关键词：
GROUNDWATER; KRYPTON; BASIN; H-3;
D O I：
10.1021/ac500415a
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Long-lived radioactive krypton isotopes, Kr-81 (t(1/2) = 229 000 year) and Kr-85 (t(1/2) = 10.76 year), are ideal tracers. Kr-81 is cosmogenic and can be used for dating groundwater beyond the C-14 age. Kr-85 is a fission product and can be applied in atmospheric studies, nuclear safety inspections, and dating young groundwater. It has long been a challenge to analyze radio-krypton in small samples, in which the total number of such isotopes can be as low as 1 x 10(5). This work presents a system developed to analyze Kr-81 and Kr-85 from a few liters of air samples. A separation system based on cryogenic distillation and gas chromatographic separation is used to extract krypton gas with an efficiency of over 90% from air samples of 1-50 L. Kr-85/Kr and Kr-81/Kr ratios in krypton gases are determined from single-atom counting using a laser-based atom trap. In order to test the performance of the system, we have analyzed various samples collected from ambient air and extracted from groundwater, with a minimum size of 1 L. The system can be applied to analyze Kr-81 and Kr-85 in environmental samples including air, groundwater, and ices.
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收藏
页码：4002 / 4007
页数：6
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