Peak shape calibration of a Cadmium Zinc Telluride detector and its application for the determination of uranium enrichment

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  • EC - JRC - European Commission - Joint Research Centre

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Abstract

Cadmium Zinc Telluride (CZT) detectors are portable, room temperature serviceable, medium-resolution gamma-ray spectrometers. Their full-energy peak shape exhibits a low energy tail which complicates the analysis of spectra with overlapping peaks. 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. 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. 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 fitting algorithm was then applied to determine the net peak areas of the full energy peak in spectra recorded with certified uranium standards. The enrichment was then determined by using the so-called ‘peak ratio’ method. 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. Hence, the enrichment was underestimated by about 10%.

Details

Original languageEnglish
Article number164718
Pages (from-to)1-13
Number of pages13
JournalNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume986
DOIs
Publication statusPublished - 11 Jan 2021

Keywords

  • Cadminium zinc telluride detectors, Medium-resolution gamma-ray spectroscopy, Peak shape calibration, Non-destructive assay, Uranium enrichment, Safeguards

ID: 6946090