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On-Site Inspection (OSI) is a key component of the verification regime forthe Comprehensive Nuclear-Test-Ban Treaty (CTBT). Measurements of radionuclideisotopes created by an underground nuclear explosion are a valuable signatureof a Treaty violation. Argon-37 is produced from neutron interaction withcalcium in soil, 40Ca(n,{\alpha})37Ar. For OSI, the 35-day half-life of 37Arprovides both high specific activity and sufficient time for completion of aninspection before decay limits sensitivity. This paper presents alow-background internal-source gas proportional counter with an 37Armeasurement sensitivity level equivalent to 45.1 mBq/SCM in whole air.

Measurement of 37Ar to support technology for On-site Inspection under the Comprehensive Nuclear-Test-Ban Treaty