Rapid processing of ⁸⁵5 Kr/Kr ratios using Atom Trap Trace Analysis

Zappala, J. C.; Bailey, K.; Mueller, P.; O'Connor, T. P.; Purtschert, Roland (2017). Rapid processing of ⁸⁵5 Kr/Kr ratios using Atom Trap Trace Analysis. Water resources research, 53(3), pp. 2553-2558. American Geophysical Union 10.1002/2016WR020082

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We report a methodology for measuring ⁸⁵ Kr/Kr isotopic abundances using Atom Trap Trace Analysis (ATTA) that increases sample measurement throughput by over an order of magnitude to six samples per 24 h. The noble gas isotope ⁸⁵ Kr (half-life 510.7 years) is a useful tracer for young groundwater in the age range of 5–50 years. ATTA, an efficient and selective laser-based atom counting method, has recently been applied to ⁸⁵ Kr/Kr isotopic abundance measurements, requiring 5–10 μL of krypton gas at STP extracted from 50 to 100 L of water. Previously, a single such measurement required 48 h. Our new method demonstrates that we can measure 85Kr/Kr ratios with 3–5% relative uncertainty every 4 h, on average, with the same sample requirements.

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