Performance of a Large Volume 20[Formula Omitted]20[Formula Omitted]15 mm[Formula Omitted] CPG Detector

Large-volume CdZnTe (CZT) single crystals with electron lifetimes exceeding 10 [Formula Omitted] recently became available commercially for making large effective area gamma-ray arrays. However, significant variations were observed in the performance of detectors made from such arrays. We evaluated...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2011-12, Vol.58 (6), p.3167
Main Authors: Bolotnikov, A. E, Babalola, S, Camarda, G. S, Cui, Y, Egarievwe, S. U, Gul, R, Hossain, A, Kim, K. Hyun, Mayo, D. R, Smith, M. K, Yang, G, James, R. B
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Language:English
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Summary:Large-volume CdZnTe (CZT) single crystals with electron lifetimes exceeding 10 [Formula Omitted] recently became available commercially for making large effective area gamma-ray arrays. However, significant variations were observed in the performance of detectors made from such arrays. We evaluated the spectroscopic performance of such a large-volume, 20[Formula Omitted]20[Formula Omitted]15 mm[Formula Omitted], coplanar-grid (CPG) CdZnTe detector, intended for use in a handheld radioisotope-identifier, which unexpectedly showed a poor spectral performance with an energy resolution of 3.5-4% FWHM measured with 662-keV gamma-rays. To understand the factors affecting its performance, we applied several characterization techniques, viz., white X-ray diffraction topography measurements, IR microscopy, and micron-spatial resolution X-ray mapping. They allowed us to identify major crystal defects in the device that limit its energy resolution and detection efficiency.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2011.2167984