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13 May 2019 Mini gamma camera based on photon-counting Frisch-grid CdZnTe detectors (Conference Presentation)
Aleksey E. Bolotnikov, Giuseppe Camarda, Gianluigi De Geronimo, Anwar Hossain, Luis Ocampo Giraldo, Ge Yang, Ralph B. James
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Proceedings Volume 11027, Quantum Optics and Photon Counting 2019; 110270G (2019) https://doi.org/10.1117/12.2520151
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic
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.
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Aleksey E. Bolotnikov, Giuseppe Camarda, Gianluigi De Geronimo, Anwar Hossain, Luis Ocampo Giraldo, Ge Yang, and Ralph B. James "Mini gamma camera based on photon-counting Frisch-grid CdZnTe detectors (Conference Presentation)", Proc. SPIE 11027, Quantum Optics and Photon Counting 2019, 110270G (13 May 2019); https://doi.org/10.1117/12.2520151
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KEYWORDS
Sensors
Cameras
Photodetectors
Imaging spectroscopy
Crystals
Gamma radiation
Gamma-ray astronomy
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