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Proceedings Paper

Mini gamma camera based on photon-counting Frisch-grid CdZnTe detectors (Conference Presentation)

Paper Abstract

Position-sensitive photon-counting virtual Frisch-grid CdZnTe (CZT) detectors provide an economical and robust design for high-efficiency gamma ray cameras for imaging and spectroscopy measurements. They can be used for a variety of applications including gamma-ray astronomy, medical and industrial imaging, environmental cleanup, nuclear safeguards and security. We present the first results from testing a 4x4 array module coupled to a front-end ASIC. Each detector in the array module operates as a mini time-projection chamber. For each gamma-ray event it provides 3D position information with high spatial- and high-spectral resolution. We employ learning algorithms based on extensive detector calibrations to reconstruct positional information and enhance the spectral resolution of the array. Also, the high-position resolution of the array allows for correcting the detectors’ response non-uniformities due to the presence of crystal defects. This allows the developers to use standard-grade (unselected) CZT crystals, while retaining good performance comparable to large-volume pixelated detectors.

Paper Details

Date Published: 13 May 2019
Proc. SPIE 11027, Quantum Optics and Photon Counting 2019, 110270G (13 May 2019); doi: 10.1117/12.2520151
Show Author Affiliations
Aleksey E. Bolotnikov, Brookhaven National Lab. (United States)
Giuseppe Camarda, Brookhaven National Lab. (United States)
Gianluigi De Geronimo, Stony Brook Univ. (United States)
Anwar Hossain, Brookhaven National Lab. (United States)
Luis Ocampo Giraldo, Brookhaven National Lab. (United States)
Ge Yang, North Carolina State Univ. (United States)
Ralph B. James, Savannah River National Lab. (United States)

Published in SPIE Proceedings Vol. 11027:
Quantum Optics and Photon Counting 2019
Ivan Prochazka; Roman Sobolewski; Ralph B. James; Peter Domokos; Adam Gali, Editor(s)

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