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Radial position of single-site gamma-ray interactions from a parametric pulse shape analysis of germanium detector signals

John L. Orrell·Craig E. Aalseth·Matthew W. Cooper·Jeremy D. Kephart·Carolyn E. Seifert
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Abstract

Pulse shape analysis of germanium gamma-ray spectrometer signals can yield information on the radial position of individual gamma-ray interactions within the germanium crystal. A parametric pulse shape analysis based on calculation of moments of the reconstructed current pulses from a closed-ended coaxial germanium detector is used to preferentially select single-site gamma-ray interactions. The double escape peak events from the 2614.5 keV gamma-ray of 208-Tl are used as a training set to optimize the single-site event selection region in the pulse shape parameter space. A collimated source of 320.1 keV gamma-rays from 51-Cr is used to scan different radial positions of the same semi-coaxial germanium detector. The previously trained single-site selection region is used to preferentially identify the single-site photoelectric absorption events from the 320.1 keV full-energy peak. From the identified events, a comparison of the pulse shape parameter space distributions between different scan positions allows radial interaction location information to be collected.

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John L. Orrell, Craig E. Aalseth, Matthew W. Cooper, Jeremy D. Kephart, Carolyn E. Seifert. 2007-03-14. Radial position of single-site gamma-ray interactions from a parametric pulse shape analysis of germanium detector signals. https://arxiv.org/abs/nucl-ex/0703022

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