Gamma spectroscopy with pixelated CdZnTe detectors

Asher Shor, Yossi Eisen, Israel Mardor

Research output: Contribution to journalConference articlepeer-review


Excellent spectroscopy for higher energy gamma-rays are obtained with thick pixelated CdZnTe detectors, despite the large hole trapping inherent in the CdZnTe material. Our detector design was assisted with the help 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 1cm×1cm×1cm CdZnTe detector where the anode is segmented to a 4×4 array of pad electrodes. For each gamma interaction, signals for all the 16 pad electrodes and 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 the full energy peak, the summed pad spectra yields energy resolution of 1.0 % FWHM. For the reconstruction of Compton events with signals in two pad electrodes, we obtain a summed peak with energy resolution of 1.4 % FWHM.

Original languageEnglish
Article numberR16-3
Pages (from-to)3579-3582
Number of pages4
JournalIEEE Nuclear Science Symposium Conference Record
StatePublished - 2003
Externally publishedYes
Event2003 IEEE Nuclear Science Symposium Conference Record - Nuclear Science Symposium, Medical Imaging Conference - Portland, OR, United States
Duration: 19 Oct 200325 Oct 2003


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