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. 2017 Aug:126:243-248.
doi: 10.1016/j.apradiso.2017.02.018. Epub 2017 Feb 17.

Development of a low-level 39Ar calibration standard - Analysis by absolute gas counting measurements augmented with simulation

R M Williams  1 , C E Aalseth  2 , J M Brandenberger  2 , A R Day  2 , E Finn  2 , E S Fuller  2 , E W Hoppe  2 , P H Humble  2 , M E Keillor  2 , E K Mace  2 , A W Myers  2 , C T Overman  2 , M E Panisko  2 , A Seifert  2 , S K White  2
Affiliations

Development of a low-level 39Ar calibration standard - Analysis by absolute gas counting measurements augmented with simulation

R M Williams et al. Appl Radiat Isot. 2017 Aug.

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).

Keywords: Absolute radiation measurement; Electroformed copper; Length compensated proportional counting; Ultra-low background; Uncertainty Analysis.

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