Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.2172/1252619 |
报告编号 | LLNL-TR--665865 |
来源ID | OSTI ID: 1252619 |
California GAMA Special Study. Development of a Capability for the Analysis of Krypton-85 in Groundwater Samples | |
Visser, Ate; Bibby, Richard K.; Moran, Jean E.; Singleton, Michael J.; Esser, Bradley K. | |
2015-06-01 | |
出版年 | 2015 |
页数 | 25 |
语种 | 英语 |
国家 | 美国 |
领域 | 地球科学 |
英文摘要 | A capability for the analysis of krypton-85 (85Kr) in groundwater samples was developed at LLNL. Samples are collected by extracting gas from 2000-4000 L of groundwater at the well, yielding approximately 0.2 cm3 STP krypton. Sample collection takes 1 to 4 hours. Krypton is purified in the laboratory using a combination of molecular sieve and activated charcoal traps, and transferred to a liquid scintillation vial. The 85Kr activity is measured by liquid scintillation on a Quantulus 1220 liquid scintillation counter from PerkinElmer. The detection limit for a typical 0.2 cm3Kr sample size is 11% of the present day activity in air, corresponding to the decay corrected activity in air in 1987. The typical measurement uncertainty is below 10% for recently recharged samples. Six groundwater samples were collected, purified and counted. 85Kr was not detected in any of the samples counted at LLNL. 85Kr was detected by the low level counting laboratory of Bern University in all samples between 1.5 and 6.6 decays per minute per cm3 krypton, corresponding to decay corrected activities in air between 1971 and 1985. The new capability is an excellent complement to tritium-helium, expanding the existing suite of age dating tools available to the GAMA program (35S, 3H/3He, 14C and radiogenic helium). 85Kr can replace 3H/3He in settings where 3H/3He ages are impossible to determine (for example where terrigenic helium overwhelms tritiogenic helium) and provides additional insight into travel time distributions in complex mixed groundwater systems. |
URL | 查看原文 |
来源平台 | US Department of Energy (DOE) |
引用统计 | |
文献类型 | 科技报告 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/6815 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Visser, Ate,Bibby, Richard K.,Moran, Jean E.,et al. California GAMA Special Study. Development of a Capability for the Analysis of Krypton-85 in Groundwater Samples,2015. |
条目包含的文件 | 条目无相关文件。 |
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