![]() ![]() Improvements in the resolutions to less than 1% were reported with special design and signal processing. Limitations in crystal growth do not allow the production of large crystals, and therefore their counting efficiency is limited. CZT detectors do not require cooling, are portable and are used for example as an attribute tester for fresh and irradiated nuclear material during safeguards inspections. The full-energy peak shapes of CZT detectors have a low energy tail due to mechanisms related to the charge transport in the crystal. Hence, CZT detectors are considered as medium resolution detectors which are situated between the high resolution offered by High Purity Germanium detectors (0.2%) and the low resolution of e.g. NaI(Tl) detectors (7%). The energy resolution at 0.662 MeV, expressed in Full Width at Half Maximum (FWHM) for the full energy peak is in the order of 1% to 3% and varies from detector to detector. Hence, the enrichment was underestimated by about 10%.Ĭadmium Zinc Telluride (CZT) detectors can be used for medium-resolution gamma-ray spectrometry applications. We observed a systematic bias in the net peak areas of the 0.258 MeV gamma-ray which therefore was not included in the analysis. The enrichment was then determined by using the so-called ‘peak ratio’ method. The peak fitting algorithm was then applied to determine the net peak areas of the full energy peak in spectra recorded with certified uranium standards. ![]() The net peak areas were used to verify the absolute detection efficiency obtained with a Monte Carlo model of the CZT detector and the agreement in absolute terms was within 10% over the considered energy range. The peak shape parameters were obtained by applying a peak fitting algorithm that includes a Gaussian and a tail with energy dependent parameters in the region around the gamma-ray peak. In this paper, we determined the peak shape parameters of a CZT detector from measurements with calibrated point sources from 0.06 MeV up to 1.332 MeV. Their full-energy peak shape exhibits a low energy tail which complicates the analysis of spectra with overlapping peaks. Cadmium Zinc Telluride (CZT) detectors are portable, room temperature serviceable, medium-resolution gamma-ray spectrometers. ![]()
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