³⁹Ar/Ar measurements using ultra-low background proportional counters.

Autor: Hall J; Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, United States. Electronic address: jeter@pnnl.gov., Aalseth CE; Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, United States., Bonicalzi RM; Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, United States., Brandenberger JM; Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, United States., Day AR; Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, United States., Humble PH; Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, United States., Mace EK; Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, United States., Panisko ME; Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, United States., Seifert A; Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, United States.
Jazyk: angličtina
Zdroj: Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine [Appl Radiat Isot] 2016 Jan; Vol. 107, pp. 187-190. Date of Electronic Publication: 2015 Oct 08.
DOI: 10.1016/j.apradiso.2015.10.006
Abstrakt: Age-dating groundwater and seawater using the (39)Ar/Ar ratio is an important tool to understand water mass-flow rates and mean residence time. Low-background proportional counters developed at Pacific Northwest National Laboratory use mixtures of argon and methane as counting gas. We demonstrate sensitivity to (39)Ar by comparing geological (ancient) argon recovered from a carbon dioxide gas well and commercial argon. The demonstrated sensitivity to the (39)Ar/Ar ratio is sufficient to date water masses as old as 1000 years.
(Copyright © 2015 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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