Groundwater dating with Atom Trap Trace Analysis of 39Ar

Ritterbusch, F.; Ebser, S.; Welte, J.; Reichel, T.; Kersting, A.; Purtschert, R.; Aeschbach-Hertig, W.; Oberthaler, M. K. (2014). Groundwater dating with Atom Trap Trace Analysis of 39Ar. Geophysical Research Letters, 41(19), pp. 6758-6764. American Geophysical Union 10.1002/2014GL061120

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We report on the realization of Atom Trap Trace Analysis for39Ar and its first application to dating of groundwater samples. The presented system achieves an atmospheric39Ar count rate as high as 3.58 ± 0.10 atoms/h allowing for the determination of the39Ar concentration in less than a day. We demonstrate that the measured count rates are proportional to the39Ar concentration by intercomparison with Low-Level Counting results and by measurements on prepared argon samples with defined concentration. For a geophysical application, we degas three different groundwater samples and gas chromatographically extract the argon. The39Ar ages inferred from the count rates extend over the accessible dating range and are in agreement with the Low-Level Counting results as well as with complementary isotope data.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics

UniBE Contributor:

Purtschert, Roland

Subjects:

500 Science > 530 Physics

ISSN:

0094-8276

Publisher:

American Geophysical Union

Language:

English

Submitter:

Doris Rätz

Date Deposited:

20 Nov 2014 16:08

Last Modified:

18 Sep 2015 14:45

Publisher DOI:

10.1002/2014GL061120

BORIS DOI:

10.7892/boris.59897

URI:

https://boris.unibe.ch/id/eprint/59897

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