Hydrology and Land Surface Studies
A new method of measuring 81Kr and 85Kr abundances in environmental samples
Article first published online: 29 OCT 2003
Copyright 2003 by the American Geophysical Union.
Geophysical Research Letters
Volume 30, Issue 20, October 2003
How to Cite
2003), A new method of measuring 81Kr and 85Kr abundances in environmental samples, Geophys. Res. Lett., 30, 2068, doi:10.1029/2003GL018293, 20., , , , , , , , , and (
- Issue published online: 29 OCT 2003
- Article first published online: 29 OCT 2003
- Manuscript Accepted: 29 SEP 2003
- Manuscript Revised: 16 SEP 2003
- Manuscript Received: 31 JUL 2003
 We demonstrate a new method for determining the 81Kr/Kr ratio in environmental samples based upon two measurements: the 85Kr/81Kr ratio measured by Atom Trap Trace Analysis (ATTA) and the 85Kr/Kr ratio measured by Low-Level Counting (LLC). This method can be used to determine the mean residence time of groundwater in the range of 105–106 a. It requires a sample of 100 μl STP of Kr extracted from approximately two tons of water. With modern atmospheric Kr samples, we demonstrate that the ratios measured by ATTA and LLC are directly proportional to each other within the measurement error of ±10%; we calibrate the 81Kr/Kr ratio of modern air measured using this method; and we show that the 81Kr/Kr ratios of samples extracted from air before and after the development of the nuclear industry are identical within the measurement error.