Answers are grounded in this paper and cite their sources.
We demonstrate a new method for determining the 81 Kr/Kr ratio in environmental samples based upon two measurements: the 85 Kr/ 81 Kr ratio measured by Atom Trap Trace Analysis (ATTA) and the 85 Kr/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 10 5 –10 6 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 81 Kr/Kr ratio of modern air measured using this method; and we show that the 81 Kr/Kr ratios of samples extracted from air before and after the development of the nuclear industry are identical within the measurement error.
No takes yet. Share an insight, caveat, or question.
A 2003 study studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: