Arrays of position-sensitive Frisch-grid CdZnTe detectors for gamma ray imaging

Aleksey E. Bolotnikov; Gabriella Carini; Alfred Dellapenna; Jack Fried; Grzegorz Deptuch; Justine Haupt; Sven Herrmann; Ralph James; Alexander Moiseev; Giovanni Pinaroli; Makoto Sasaki; Eric Yates

doi:10.1117/12.2596696

1 August 2021 Arrays of position-sensitive Frisch-grid CdZnTe detectors for gamma ray imaging

Aleksey E. Bolotnikov, Gabriella Carini, Alfred Dellapenna, Jack Fried, Grzegorz Deptuch, Justine Haupt, Sven Herrmann, Ralph James, Alexander Moiseev, Giovanni Pinaroli, Makoto Sasaki, Eric Yates

Author Affiliations +

Proceedings Volume 11838, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIII; 1183803 (2021) https://doi.org/10.1117/12.2596696
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

We report on the results from testing CdZnTe (CZT) position-sensitive virtual Frisch-grid (VFG) detectors and a prototype of a 16x16 detector array proposed for a high-energy gamma ray imaging space telescope. Previously, we evaluated the spectroscopic performance of these detectors. Here, we present results from our detector performance studies with an emphasis on position resolution. We employed digital waveform capturing and analog ASIC based approaches to read out the signals from the detectors and evaluate their spectral- and spatial-resolution. The VFG arrays allow for the flexibility to scale-up the dimensions of the detectors for the desired efficiency, while the position information allows for correcting the detectors’ response non-uniformities caused by crystal defects and device geometry, thereby reducing the instrument cost and making them more feasible for emerging applications in gamma-ray astronomy, nonproliferation, portal screening and nuclear safeguards, where large

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Aleksey E. Bolotnikov, Gabriella Carini, Alfred Dellapenna, Jack Fried, Grzegorz Deptuch, Justine Haupt, Sven Herrmann, Ralph James, Alexander Moiseev, Giovanni Pinaroli, Makoto Sasaki, and Eric Yates "Arrays of position-sensitive Frisch-grid CdZnTe detectors for gamma ray imaging", Proc. SPIE 11838, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIII, 1183803 (1 August 2021); https://doi.org/10.1117/12.2596696

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KEYWORDS

Sensors

Gamma ray imaging

Imaging arrays

Detector arrays

Sensor performance

Signal detection

Gamma-ray astronomy

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