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Title: Optimizing CdZnTeSe Frisch-Grid Nuclear Detector for Gamma-Ray Spectroscopy

Abstract

Wide bandgap semiconductor materials capable of detecting X-rays and gamma-rays at room temperature without cryogenic cooling have great advantages that include portability and wide-area deployment in nuclear and radiological threat defense. Additional major applications include medical imaging, spectroscopy, and astrophysics. Most current room-temperature ionizing radiation detector devices are fabricated from cadmium telluride (CdTe) and cadmium zinc telluride (CdZnTe). Cadmium zinc telluride selenide (CdZnTeSe or CZTS) can be grown with high crystal yield compared to CdTe and CdZnTe. Thus, CZTS has the advantage of lowering the cost of room-temperature nuclear detectors. Thick CdTe-based detectors are prone to the trapping of charge carriers, thus limiting energy resolution and efficiency. A Frisch-Grid configuration helps to solve this problem. This research is focused on optimizing the Frisch-grid configuration for a CZTS detector. The CZTS was grown by traveling heater method. Infrared images of the CZTS matrix largely showed the absence of tellurium inclusions. The resistivity of the CZTS obtained from a current-voltage plot is of the order of 10 10 Ω.cm. The charge-transport characterized by measuring the electron mobility-lifetime product is 4.7 × 10 -3 cm 2/V. Detector resolution was measured for various Frisch-ring widths. For a 4.8 × 4.9 × 9.7 mm 3more » detector, the best Frisch-ring widths were found to be 3-4 mm. A detector resolution of 1.35% full-width-at-half-maximum was obtained for the 3-mm width at -2300 V bias voltage for the 662-keV gamma peak of 137Cs. A resolution of 1.36% was obtained for the 4-mm width at -1800 V applied bias.« less

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [1];  [1];  [5]
  1. Alabama A&M Univ., Huntsville, AL (United States)
  2. Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL); Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Federal Univ. of Petroleum Resources, Effurun (Nigeria)
  4. Univ. of South Alabama, Mobile, AL (United States)
  5. Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)
Publication Date:
Research Org.:
Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation; National Science Foundation (NSF); USNRC; USDOE Office of Environmental Management (EM)
OSTI Identifier:
1756602
Report Number(s):
SRNL-STI-2020-00230
Journal ID: ISSN 2169-3536
Grant/Contract Number:  
AC09-08SR22470; 1818732; 31310018M0035
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
IEEE Access
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2169-3536
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CdZnTeSe detectors; detector resolution; Frisch-grid; gamma-ray detector; nuclear radiation detector; traveling heater method; X-ray detector

Citation Formats

Egarievwe, Stephen U., Roy, Utpal N., Agbalagba, Ezekiel O., Harrison, Benicia A., Goree, Carmella A., Savage, Emmanuel K., and James, Ralph B. Optimizing CdZnTeSe Frisch-Grid Nuclear Detector for Gamma-Ray Spectroscopy. United States: N. p., 2020. Web. doi:10.1109/access.2020.3012040.
Egarievwe, Stephen U., Roy, Utpal N., Agbalagba, Ezekiel O., Harrison, Benicia A., Goree, Carmella A., Savage, Emmanuel K., & James, Ralph B. Optimizing CdZnTeSe Frisch-Grid Nuclear Detector for Gamma-Ray Spectroscopy. United States. https://doi.org/10.1109/access.2020.3012040
Egarievwe, Stephen U., Roy, Utpal N., Agbalagba, Ezekiel O., Harrison, Benicia A., Goree, Carmella A., Savage, Emmanuel K., and James, Ralph B. Mon . "Optimizing CdZnTeSe Frisch-Grid Nuclear Detector for Gamma-Ray Spectroscopy". United States. https://doi.org/10.1109/access.2020.3012040. https://www.osti.gov/servlets/purl/1756602.
@article{osti_1756602,
title = {Optimizing CdZnTeSe Frisch-Grid Nuclear Detector for Gamma-Ray Spectroscopy},
author = {Egarievwe, Stephen U. and Roy, Utpal N. and Agbalagba, Ezekiel O. and Harrison, Benicia A. and Goree, Carmella A. and Savage, Emmanuel K. and James, Ralph B.},
abstractNote = {Wide bandgap semiconductor materials capable of detecting X-rays and gamma-rays at room temperature without cryogenic cooling have great advantages that include portability and wide-area deployment in nuclear and radiological threat defense. Additional major applications include medical imaging, spectroscopy, and astrophysics. Most current room-temperature ionizing radiation detector devices are fabricated from cadmium telluride (CdTe) and cadmium zinc telluride (CdZnTe). Cadmium zinc telluride selenide (CdZnTeSe or CZTS) can be grown with high crystal yield compared to CdTe and CdZnTe. Thus, CZTS has the advantage of lowering the cost of room-temperature nuclear detectors. Thick CdTe-based detectors are prone to the trapping of charge carriers, thus limiting energy resolution and efficiency. A Frisch-Grid configuration helps to solve this problem. This research is focused on optimizing the Frisch-grid configuration for a CZTS detector. The CZTS was grown by traveling heater method. Infrared images of the CZTS matrix largely showed the absence of tellurium inclusions. The resistivity of the CZTS obtained from a current-voltage plot is of the order of 1010 Ω.cm. The charge-transport characterized by measuring the electron mobility-lifetime product is 4.7 × 10-3 cm2/V. Detector resolution was measured for various Frisch-ring widths. For a 4.8 × 4.9 × 9.7 mm3 detector, the best Frisch-ring widths were found to be 3-4 mm. A detector resolution of 1.35% full-width-at-half-maximum was obtained for the 3-mm width at -2300 V bias voltage for the 662-keV gamma peak of 137Cs. A resolution of 1.36% was obtained for the 4-mm width at -1800 V applied bias.},
doi = {10.1109/access.2020.3012040},
url = {https://www.osti.gov/biblio/1756602}, journal = {IEEE Access},
issn = {2169-3536},
number = ,
volume = 8,
place = {United States},
year = {2020},
month = {7}
}

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