Performance of CdZnTe coplanar-grid gamma-ray detectors

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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. These ... continued below

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6 p.

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Luke, P.N. & Eissler, E.E. November 1, 1995.

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  • Luke, P.N. Lawrence Berkeley Lab., CA (United States)
  • Eissler, E.E. eV Products, Saxonburg, PA (United States). Div. of II-VI Incorporated

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Description

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. These 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.

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6 p.

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INIS; OSTI as DE96004727

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  • IEEE nuclear science symposium and medical imaging conference, San Francisco, CA (United States), 21-28 Oct 1995

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  • Other: DE96004727
  • Report No.: LBL--37962
  • Report No.: CONF-951073--17
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 197795
  • Archival Resource Key: ark:/67531/metadc667859

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • November 1, 1995

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  • June 29, 2015, 9:42 p.m.

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  • April 5, 2016, 10:25 a.m.

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Luke, P.N. & Eissler, E.E. Performance of CdZnTe coplanar-grid gamma-ray detectors, article, November 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc667859/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.