Simulation and validation of a planar HPGe detector signal database for use in pulse shape analysis

E. Rintoul,A. J. Boston,H. C. Boston,A. Caffrey,L. J. Harkness-Brennan,D. S. Judson,P. J. Nolan,J. Platt,C. Unsworth,J. P. Wright,T. F. Woodroof,P. Quirin

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment（2022）

Univ Liverpool | Mirion Technol Canberra

Cited 1|Views28

Abstract

Due to their excellent spectroscopic capabilities and sensitivity to the position of gamma-ray interactions, segmented High-Purity Germanium (HPGe) detectors are frequently used in gamma-ray imaging applications. The quality of produced images is heavily dependent on the precision of the identification of interaction position within the detector that can be achieved through segmentation and the application of pulse shape analysis (PSA) techniques. In this work, a simulated database of signals was produced for a HPGe planar detector used in a multi-tiered Compton camera system. The impurity concentration and temperature-dependent mobility parameters of the simulation were optimised and validated by evaluating the pulse-shape response at select positions using experimentally-measured collimated gamma-beam data. A grid-search algorithm was developed for analysis of single and double-site gamma-ray interactions using signal comparison PSA and is shown to improve the position resolution within the detector.

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Key words

HPGe detector,Detector simulation,Charge collection,Pulse shape analysis

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