Gamma spectroscopy with pixelated CdZnTe detectors

Asher Shor, Yossi Eisen, Israel Mardor

Research output: Contribution to journalArticlepeer-review

Abstract

Excellent spectroscopy for higher energy gamma-rays Is obtained with thick pixelated CdZnTe detectors, despite the large hole trapping inherent in the CdZnTe material. Our detector design was assisted by means of a theoretical Monte-Carlo code for optimizing the pixelated detector geometry for obtaining pad signals with minimum dependence on the depth of gamma interaction. We present spectra obtained for the 662-keV line of 137Cs taken with a 1 cm × 1 cm × 1 cm CdZnTe detector with the anode segmented to a 4 × 4 array of pad electrodes. For each gamma interaction, signals for all 16 pad of the electrodes and for the common cathode electrode were digitized to enable further correction for the depth of gamma interaction and for the reconstruction of Compton scatter interactions. For single pixel events, the summed pad spectrum yields an energy resolution of 1.0% FWHM. For the reconstruction of Compton events with signals in two pad electrodes, we obtain a summed peak with an energy resolution of 1.4% FWHM.

Original languageEnglish
Pages (from-to)1204-1208
Number of pages5
JournalIEEE Transactions on Nuclear Science
Volume51
Issue number3 III
DOIs
StatePublished - Jun 2004
Externally publishedYes

Keywords

  • CdZnTe detectors
  • Gamma spectroscopy

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