Gamma-ray imaging performance of the GRI+ Compton camera


Caffrey, A, Harkness-Brennan, LJ, Alshammari, H, Boston, AJ, Boston, HC ORCID: 0000-0003-0721-3458, Griffiths, O, Judson, DS ORCID: 0000-0003-1313-5206, Kalantan, S, Le Crom, B, Nolan, PJ et al (show 11 more authors) (2021) Gamma-ray imaging performance of the GRI+ Compton camera Journal of Instrumentation, 16 (09). P09015-P09015. ISSN 1748-0221, 1748-0221

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Abstract

GRI+ (Gamma-Ray Imager) is a cart-based Compton camera developed at the University of Liverpool. The system comprises three electrically-cooled semiconductor detectors; two planar double-sided strip detectors (Si(Li) and HPGe) and an HPGe coaxial detector. The mobile cart houses the necessary components for data acquisition and analysis, providing complete functionality for imaging gamma-ray sources in an industrial setting. This paper reports on the operation of the system and the methods used to improve intrinsic system performance. The processing chain for extracting information pertaining to gamma-ray interactions has been developed and the imaging performance is characterised using an analytical reconstruction code. The obtainable Angular Resolution Measure (ARM) from a Cs-137 point source placed 10.5 cm from the front of the Si(Li) cryostat was determined to be 4.12° after the application of data processing techniques. The system energy resolution, which is key to isotope identification and image quality, was calculated to be less than 0.5% at 1332.5 keV.

Item Type: Article
Uncontrolled Keywords: Compton imaging, Solid state detectors
Divisions: Faculty of Science & Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 11 Oct 2021 08:38
Last Modified: 16 Jun 2026 09:23
DOI: 10.1088/1748-0221/16/09/p09015
Open Access URL: https://iopscience.iop.org/article/10.1088/1748-02...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3140039
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