PNNL

Abstract

ABSTRACT The Pacific Northwest National Laboratory is currently developing a custom software suite capable of automating many of the tasks required to accurately analyze coincident signals within detector arrays. This capability is required to enable rapid analysis of data collected with a new low-background intrinsic germanium (HPGe) array at PNNL. The system is designed to intelligently identify which algorithm best applies to a dataset in order to quantify the activities of isotopes observed in the sample. The HPGe array is designed for high detection efficiency, ultra-low-background performance, and sensitive gamma-gamma coincidence detection. Traditional methods for constructing ultra-low-background detectors were followed, including use of materials known to be low in radioactive contaminants, use of ultra pure reagents, and clean room assembly. The cryostat is constructed mainly from copper electroformed into near-final geometry at Pacific Northwest National Laboratory. The array was recently installed into a new shallow underground laboratory facility with approximately 35 meters water equivalent overburden. Details of the new facility, the detector assembly, initial background results, and the status of the CASCADES analysis development are presented.