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A new shallow underground gas-proportional counting lab--first results and Ar-37 sensitivity
C E Aalseth1, A R Day, E S Fuller
1Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, MSIN J4-65, Richland, WA 99352, USA. craig.aalseth@pnnl.gov
Abstract:
A new ultra-low-background proportional counter was recently developed with an internal volume of 100 cm(3) and has been characterized at pressures from 1-10 atm with P-10 (90% Ar, 10% methane) gas. This design, along with a counting system providing event digitization and passive and active shielding, has been developed to complement a new shallow underground laboratory (30 m water-equivalent). Backgrounds and low-level reference materials have been measured, and system sensitivity for (37)Ar has been calculated.
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