Performance Study of Virtual Frisch Grid CdZnTeSe Detectors

Roy, Utpal N.; Camarda, Giuseppe S.; Cui, Yonggang; James, Ralph B.

doi:10.3390/instruments6040069

Title: Performance Study of Virtual Frisch Grid CdZnTeSe Detectors

Journal Article · Wed Oct 26 00:00:00 EDT 2022 · Instruments

DOI:https://doi.org/10.3390/instruments6040069· OSTI ID:1915268

Roy, Utpal N. ^[1]; Camarda, Giuseppe S. ^[2];

^[2]; James, Ralph B. ^[1]

Savannah River National Laboratory (SRNL), Aiken, SC (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Nuclear detectors for x-ray and gamma-ray spectroscopy and imaging are a vital tool in many homeland security, medical imaging, astrophysics and other applications. Most of these applications require room-temperature operation due to the operational constraints imposed by a cryogenic cooling system. CdZnTe (CZT) has been the main material with the desired detection properties, and CZT crystals have been used commercially for three decades. However, CdZnTe still suffers from long-standing issues of high densities of performance-limiting intrinsic defects such as Te inclusions and networks of dislocation walls (sub-grain boundaries). A recently invented new quaternary material CdZnTeSe showed excellent material properties for radiation detection. The material was found to be free from dislocation networks, possess reduced Te inclusions, and have better compositional homogeneity. Virtual Frisch grid detectors were fabricated from crystals taken from a CdZnTeSe ingot that was grown by the traveling heater method. The detectors were fabricated from an as-grown ingot, bypassing the post-growth annealing process commonly practiced for industrial-grade CZT. The performances of the detectors were studied with different Frisch grid lengths using an amplifier shaping time ranging from 1–6 µs. The detectors showed high-quality spectroscopic performance with an as-measured energy resolution of ~1.1% at 662 keV for an optimum Frisch grid length of 3 mm. The charge collection was observed to enhance for longer Frisch grids.

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Research Organization:: Savannah River Site (SRS), Aiken, SC (United States); Savannah River National Laboratory (SRNL), Aiken, SC (United States)

Sponsoring Organization:: USDOE Office of Environmental Management (EM); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation

Grant/Contract Number:: 89303321CEM000080

OSTI ID:: 1915268

Report Number(s):: SRNL-STI-2022-00440; TRN: US2312226

Journal Information:: Instruments, Vol. 6, Issue 4; ISSN 2410-390X

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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