Physics – Instrumentation and Detectors
Scientific paper
2011-10-11
Physics
Instrumentation and Detectors
6 pages, 6 figures, submitted to Nuclear Instruments and Methods in Physics A
Scientific paper
We report preliminary results from a synchrotron radiation study of Te inclusions in a large volume single crystal CdZnTe (CZT) coplanar-grid detector. The experiment was carried out by probing individual inclusions with highly collimated monochromatic X-and gamma-ray beams. It was found that for shallow X-ray interaction depths, the effect of an inclusion on measured energy loss spectra is to introduce a ~10% shift in the peak centroid energy towards lower channel numbers. The total efficiency is however not affected, showing that the net result of inclusions is a reduction in the Charge Collection Efficiency (CCE). For deeper interaction depths, the energy-loss spectra shows the emergence of two distinct peaks, both downshifted in channel number. We note that the observed spectral behavior shows strong similarities with that reported in semiconductors which exhibit polarization effects, suggesting that the underlying mechanism is common.
Gostilo Vladimir
Hansson Conny C. T.
Kozorezov Alexander
Lumb David
Owens Alan
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