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• W2911231256 abstract "Abstract The measurement of 37Ar has been proposed as a method of detecting underground nuclear testing. The isotope 37Ar is generated by neutron activation of calcium by the reaction, 40Ca(n, a)37Ar, and, as a noble gas, is able to migrate more freely underground. Pacific Northwest National Laboratory has developed a high throughput 37 Ar collection and measurement system using modified Ultra-Low Background Proportional Counters (ULBPCs). This system is capable of collecting, purifying, and measuring radioactivity in argon from either atmospheric or soil gas samples. This process is automated, with minimal operator intervention. This paper describes quantification of 37Ar and how we account for varying background conditions. An example is provided in which 39Ar has been shown to be a significant background in some sample sets, created by process 39K(n,p)39 Ar during an underground nuclear explosion that would also create 37Ar. To account for the large background of 39Ar, we fit the data with a constant plus exponential background model with Gaussian signal model and use the results of a constrained fit to calculate 37Ar activity. We discuss the methods used to purify and count samples. We discuss the impact of increased 39Ar backgrounds on the measurement of 37Ar." @default.
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• W2911231256 date "2020-02-01" @default.
• W2911231256 modified "2023-10-01" @default.
• W2911231256 title "Characterization of a low background proportional counter for a high throughput Argon-37 collection and measurement system" @default.
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• W2911231256 doi "https://doi.org/10.1016/j.nima.2019.01.021" @default.
• W2911231256 hasPublicationYear "2020" @default.
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