使用超低本底正比计数器进行³⁹Ar/Ar测量。
³⁹Ar/Ar measurements using ultra-low background proportional counters.
作者信息
Hall Jeter, Aalseth Craig E, Bonicalzi Ricco M, Brandenberger Jill M, Day Anthony R, Humble Paul H, Mace Emily K, Panisko Mark E, Seifert Allen
机构信息
Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, United States.
Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, United States.
出版信息
Appl Radiat Isot. 2016 Jan;107:187-190. doi: 10.1016/j.apradiso.2015.10.006. Epub 2015 Oct 8.
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.
利用³⁹Ar/Ar比值对地下水和海水进行年代测定是了解水体流速和平均停留时间的重要工具。太平洋西北国家实验室开发的低本底正比计数器使用氩气和甲烷的混合物作为计数气体。我们通过比较从二氧化碳气井中回收的地质（古老）氩气和商业氩气来证明对³⁹Ar的灵敏度。所展示的对³⁹Ar/Ar比值的灵敏度足以测定年龄达1000年的水体年代。
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