Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2010-08-04
Nucl.Instrum.Meth.A652:58-61,2011
Physics
Nuclear Physics
Nuclear Experiment
Submitted to Nucl. Instru. Meth. A for peer review a part of the proceedings of the 2010 Symposium on Radiation Measurements a
Scientific paper
10.1016/j.nima.2010.09.135
On-Site Inspection (OSI) is a key component of the verification regime for the Comprehensive Nuclear-Test-Ban Treaty (CTBT). Measurements of radionuclide isotopes created by an underground nuclear explosion are a valuable signature of a Treaty violation. Argon-37 is produced from neutron interaction with calcium in soil, 40Ca(n,{\alpha})37Ar. For OSI, the 35-day half-life of 37Ar provides both high specific activity and sufficient time for completion of an inspection before decay limits sensitivity. This paper presents a low-background internal-source gas proportional counter with an 37Ar measurement sensitivity level equivalent to 45.1 mBq/SCM in whole air.
Aalseth Craig E.
Day Adam R.
Haas D. A.
Hoppe E. W.
Hyronimus B. J.
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