Peak Shape Characterization of a 500 mm3 Cadmium Zinc Telluride Detector and Analysis of Spectroscopic Measurement Data for Uranium Samples

Publication Date
Alessandro Borella
Michel Bruggeman
Riccardo Rossa
Peter Schillebeeckx
Tim Vidmar

Gamma-ray spectra of calibrated sources and reference standard samples of uranium were recorded with a 500 mm3 Cadmium Zinc Telluride (CZT) detector. The measurements with calibrated sources were used to set up the peak-shape calibration of the CZT detector as a function of the deposited energy and the obtained net peak areas were compared with the ones obtained with Monte Carlo modelling. The obtained calibrations were then used to determine net peak areas in spectra measured of low-enriched uranium standard samples with the aim to determine their uranium enrichment with the “peak-ratio method.” The results of the analyses of different samples show that both the net peak area of the 0.258 MeV gamma ray and the intrinsic detector efficiency have a strong impact on the determined enrichment. In addition, the impact of the values of gamma-ray emission probabilities from different data libraries was also studied.