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Title: PERFORMANCE OF MULTI-ELEMENT CdZnTe DETECTORS

Abstract

No abstract prepared.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
785075
Report Number(s):
LA-UR-99-2933
TRN: US0302419
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Nov 1999
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; PERFORMANCE; CDTE SEMICONDUCTOR DETECTORS; MULTI-ELEMENT ANALYSIS; ZINC TELLURIDES

Citation Formats

C. E. MOSS, K. D. IANAKIEV, and ET AL. PERFORMANCE OF MULTI-ELEMENT CdZnTe DETECTORS. United States: N. p., 1999. Web.
C. E. MOSS, K. D. IANAKIEV, & ET AL. PERFORMANCE OF MULTI-ELEMENT CdZnTe DETECTORS. United States.
C. E. MOSS, K. D. IANAKIEV, and ET AL. 1999. "PERFORMANCE OF MULTI-ELEMENT CdZnTe DETECTORS". United States. doi:. https://www.osti.gov/servlets/purl/785075.
@article{osti_785075,
title = {PERFORMANCE OF MULTI-ELEMENT CdZnTe DETECTORS},
author = {C. E. MOSS and K. D. IANAKIEV and ET AL},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1999,
month =
}

Conference:
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  • No abstract prepared.
  • We present results of experiments to characterize two large-volume, multi-element CdZnTe detectors for gamma-ray spectroscopy at high energy. The first detector consisted of four 1.5 cm x 1.5 cm x 0.75 cm coplanar grid detectors. The measurements for the four-element design were performed with various configurations. The second detector consisted of eight 1 cm x 1 cm x 0.5 cm coplanar grid detectors arranged in a 2 x 2 x 2 array. The high-energy gamma-ray sources included {sup 60}Co(1332), {sup 228}Th(2614), {sup 244}Cm/{sup 13}C(6129), and Fe(n,{gamma})(7645). The front-end electronics consisted of eight spectroscopy-grade preamplifiers/shapers/pulse stretchers, built on circuit boards closemore » to the arrays. For the four-element measurements the shapers/pulse stretchers were replaced with commercial amplifiers. An eight-channel data acquisition system with list mode output was used to record gamma-ray events for each detector element in each array. The list mode data were analyzed to produce coincidence and singles spectra and efficiencies for the various sources. The Compton continuum and the escape peaks are suppressed in the coincidence spectra relative to the singles spectra. We compare these spectra and efficiencies at high energy to results at lower energies and to Monte Carlo predictions.« less
  • A small pixellated gamma-ray detector has been constructed from a 5 mm thick CdZnTe substrate and characterized for spectroscopic and spatial properties. Emphasis has been placed on revealing pixel-level results to further understand optimum array design and operation. The anode design is (1.5 x 1.5) mm{sup 2} pixels on a 1.625 mm pitch. Spectroscopic results with a {sup 57}Co source display an average energy resolution of 3.9 keV FHWM. Analysis of the electronic noise for different pixels showed good agreement with a theoretical model, and similar performance between edge and interior pixels. A test of spatial response with incident radiationmore » scanned across the anode face show good agreement with the pixel geometry and an undetectable amount of dependence on interaction depth.« less
  • No abstract prepared.
  • CdZnTe crystals grown using the high-pressure Bridgman method exhibit many properties that are desirable for radiation detector fabrication, such as high resistivity, stable operation, relative ease of processing, and the availability of large volume crystals. However, as is common with other compound semi-conductor materials, currently available CdZnTe crystals have poor charge transport characteristics. This seriously the spectral performance of detectors, especially in gamma-ray detection. The coplanar-grid detection technique was recently developed to address such charge collection problems. This technique was first demonstrated using a 5 mm cube CdZnTe detector, and a dramatic improvement in spectral response has been achieved. Thesemore » early results verified the effectiveness of this technique and suggested that large-volume gamma-ray detectors with high energy resolution can be realized. To further the development of such detectors, it is important to understand the various factors that affect detector performance. The purpose of this paper is to examine the effects of material properties on the spectral performance of CdZnTe coplanar-grid detectors. Theoretical spectral response is to show the level of performance that can be achieved given the typical carrier mobility-lifetime ({mu}{tau}) properties of present-day materials. Nonuniformity in the charge transport properties of the material, which could limit the energy resolution of the detectors, has been studied experimentally and some of the results are presented here.« less