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Title: A New Shallow Underground Gas-Proportional Counting Lab - First Results and Ar-37 Sensitivity

Abstract A new ultra-low-background proportional counter was recently developed with an internal volume of 100 ml and has been characterized at pressures from 1-10 atmospheres 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 meters water-equivalent). Backgrounds and low-level reference materials have been measured, and system sensitivity for Ar-37 has been calculated.
Authors:
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Publication Date:
OSTI Identifier:
1194332
Report Number(s):
PNNL-SA-89606
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Radiation and Isotopes, 81:151-155
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
argon-37; proportional counter; shallow underground; beta spectroscopy