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Title: Material properties of large-volume cadmium zinc telluride crystals and their relationship to nuclear detector performance

Abstract

The material showing the greatest promise today for production of large-volume gamma-ray spectrometers operable at room temperature is cadmium zinc telluride (CZT). Unfortunately, because of deficiencies in the quality of the present material, high-resolution CZT spectrometers have thus far been limited to relatively small dimensions, which makes them inefficient at detecting high photon energies and ineffective for weak radiation signals except in near proximity. To exploit CZT fully, it will be necessary to make substantial improvements in the material quality. Improving the material involves advances in the purity, crystallinity, and control of the electrical compensation mechanism. Sandia National Laboratories, California, in close collaboration with US industry and academia, has initiated efforts to develop a detailed understanding of the underlying material problems limiting the performance of large volume gamma-ray spectrometers and to overcome them through appropriate corrections therein. A variety of analytical and numerical techniques are employed to quantify impurities, compositional and stoichiometric variations, crystallinity, strain, bulk and surface defect states, carrier mobilities and lifetimes, electric field distributions, and contact chemistry. Data from these measurements are correlated with spatial maps of the gamma-ray and alpha particle spectroscopic response to determine improvements in the material purification, crystal growth, detector fabrication, and surfacemore » passivation procedures. The results of several analytical techniques will be discussed. The intended accomplishment of this work is to develop a low-cost, high-efficiency CZT spectrometer with an active volume of 5 cm{sup 3} and energy resolution of 1--2% (at 662 keV), which would give the US a new field capability for screening radioactive substances.« less

Authors:
;  [1];  [1]
  1. Sandia National Labs., Livermore, CA (United States)
Publication Date:
Research Org.:
Sandia National Labs., Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Research, Washington, DC (United States)
OSTI Identifier:
563292
Report Number(s):
SAND-97-8615C; CONF-9710129-
ON: DE97053783; TRN: 98:002390
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: 1997 U.S. workshop on the physics and chemistry of II-VI materials, Santa Barbara, CA (United States), 21-23 Oct 1997; Other Information: PBD: [1997]
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 36 MATERIALS SCIENCE; GAMMA SPECTROMETERS; CADMIUM TELLURIDES; ZINC TELLURIDES; SEMICONDUCTOR DETECTORS; AMBIENT TEMPERATURE; PERFORMANCE; CHEMICAL COMPOSITION; STOICHIOMETRY; CRYSTAL STRUCTURE; PHYSICAL PROPERTIES; CRYSTAL GROWTH

Citation Formats

James, R B, Lund, J, Yoon, H, and Univ. of California, Los Angeles, CA. Material properties of large-volume cadmium zinc telluride crystals and their relationship to nuclear detector performance. United States: N. p., 1997. Web.
James, R B, Lund, J, Yoon, H, & Univ. of California, Los Angeles, CA. Material properties of large-volume cadmium zinc telluride crystals and their relationship to nuclear detector performance. United States.
James, R B, Lund, J, Yoon, H, and Univ. of California, Los Angeles, CA. Mon . "Material properties of large-volume cadmium zinc telluride crystals and their relationship to nuclear detector performance". United States. https://www.osti.gov/servlets/purl/563292.
@article{osti_563292,
title = {Material properties of large-volume cadmium zinc telluride crystals and their relationship to nuclear detector performance},
author = {James, R B and Lund, J and Yoon, H and Univ. of California, Los Angeles, CA},
abstractNote = {The material showing the greatest promise today for production of large-volume gamma-ray spectrometers operable at room temperature is cadmium zinc telluride (CZT). Unfortunately, because of deficiencies in the quality of the present material, high-resolution CZT spectrometers have thus far been limited to relatively small dimensions, which makes them inefficient at detecting high photon energies and ineffective for weak radiation signals except in near proximity. To exploit CZT fully, it will be necessary to make substantial improvements in the material quality. Improving the material involves advances in the purity, crystallinity, and control of the electrical compensation mechanism. Sandia National Laboratories, California, in close collaboration with US industry and academia, has initiated efforts to develop a detailed understanding of the underlying material problems limiting the performance of large volume gamma-ray spectrometers and to overcome them through appropriate corrections therein. A variety of analytical and numerical techniques are employed to quantify impurities, compositional and stoichiometric variations, crystallinity, strain, bulk and surface defect states, carrier mobilities and lifetimes, electric field distributions, and contact chemistry. Data from these measurements are correlated with spatial maps of the gamma-ray and alpha particle spectroscopic response to determine improvements in the material purification, crystal growth, detector fabrication, and surface passivation procedures. The results of several analytical techniques will be discussed. The intended accomplishment of this work is to develop a low-cost, high-efficiency CZT spectrometer with an active volume of 5 cm{sup 3} and energy resolution of 1--2% (at 662 keV), which would give the US a new field capability for screening radioactive substances.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {9}
}

Conference:
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