The measurement of 37 Ar has been proposed as a method of detecting underground
nuclear testing. The isotope 37 Ar is generated by neutron activation of calcium by the …

Abstract A Noble Gas Migration Experiment injected 127 Xe, 37 Ar, and sulfur hexafluoride
into a former underground nuclear explosion shot cavity. These tracer gases were allowed …

Plastic dielectric materials are required in radiation and rare event physics detectors as
structural parts, insulators, seals, light reflectors, and in connectors. In order to observe …

Krypton-81 was applied to investigate the age of groundwater in the aquifer system in the
Bangkok metropolitan and vicinity areas. Stable (2H, 18O and 13C) and radioactive (3H …

Abstract Pacific Northwest National Laboratory has accumulated years of data with ultra-low-
background proportional counters collected in an on-site shallow underground laboratory …

This paper describes the generation of 39 Ar, via reactor irradiation of potassium carbonate,
followed by quantitative analysis (length-compensated proportional counting) to yield two …

The performance of LSC cocktails in ultra-sensitive applications was evaluated.
Backgrounds from radioactive contaminations in commercially available and in-house …

Argon-37 is an environmental signature of an underground nuclear explosion. Producing
and quantifying low-level 37 Ar standards is an important step in the development of …

The mass concentrations of 232 Th and 238 U in several strong, unfilled, high performance
polymers are reported as measures of their radiopurity. Highly radiopure polymers are …

Abstract Development of ultra low background gas proportional counters has made the
contribution from naturally occurring radioactive isotopes–primarily α and β activity in the …