Performance of a large volume 20 ×20× 15 mm 3 CPG detector

A. E. Bolotnikov, S. Babalola, G. S. Camarda, Y. Cui, S. U. Egarievwe, R. Gul, A. Hossain, K. Hyun Kim, D. R. Mayo, M. K. Smith, G. Yang, R. B. James

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Large-volume CdZnTe (CZT) single crystals with electron lifetimes exceeding 10 μs 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 × 20×15 mm 3, 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.

Original languageEnglish
Article number6043886
Pages (from-to)3167-3171
Number of pages5
JournalIEEE Transactions on Nuclear Science
Issue number6 PART 2
Publication statusPublished - 2011 Dec
Externally publishedYes


  • CdZnTe
  • crystal defects
  • radiation detectors

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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