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Development of a low-level 39Ar calibration standard - Analysis by absolute gas counting measurements augmented with
R M Williams1, C E Aalseth1, J M Brandenberger1
1Pacific Northwest National Laboratory, PO Box 999, Richland, WA 99352, USA.
Abstract:
This paper describes the generation of 39Ar, via reactor irradiation of potassium carbonate, followed by quantitative analysis (length-compensated proportional counting) to yield two calibration standards that are respectively 50 and 3 times atmospheric background levels. Measurements were performed in Pacific Northwest National Laboratory's shallow underground counting laboratory studying the effect of gas density on beta-transport; these results are compared with simulation. The total expanded uncertainty of the specific activity for the ~50× 39Ar in P10 standard is 3.6% (k=2).
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