Determination of the uranium enrichment without calibration standards using a 500 mm3 CdZnTe room temperature detector with a hybrid methodology based on peak ratios method and Monte Carlo counting efficiency simulations

Abstract

Determination of the uranium enrichment without calibration standards using a 500â¯mm 3 CdZnTe room temperature detector with a hybrid methodology based on peak ratios method and Monte Carlo counting efficiency simulations Article. Version publiée-Published version.

A novel asymmetrical peak broadening feature for a CdZnTe detector response function modeling using PHITS particle and heavy ion transport simulation code

“…The choice of only one tailing component is suggested by the difficulty to segregate the processes that are due to only incomplete charge collection from X-ray escape effects due to a complex shape of the CZT crystal, as well as its room temperature operation and the fact that the electric field strength throughout the detector volume is not constant. Thus, such a single exponential-term functional form for the tailing component implicitly accounts for the mentioned effects that lead to low-energy photopeak asymmetry and, as it was recently shown by Meleshenkovskii I. et al [24] allows to model the complex peak shape behavior of experimental spectra measured on a small CZT detector of a quasi-hemispherical design.…”

Making isotopic composition artificially intelligent: Conceptual design and performance assessment of pattern recognition algorithms for uranium enrichment determination tasks using CZT and LaBr3(Ce) detectors

“…The only gamma-ray peak that allows to bridge the two sides of uranium spectra is the 258 keV gamma-ray peak of 234m Pa, which has a relatively low emission probability and is subject to masking by the background noise. Uranium spectra particularities and spectroscopic performance of a 2 × 2 inch LaBr 3 (Ce) and a 500 mm 3 CZT detectors were discussed in detail in our previous research [12,13]. In the work presented in this paper we used same CBNM uranium standards.…”

“…From the algorithm perspective, the mentioned uranium spectra particularities represent significant challenges especially for small CZT detectors, as in the net peak area based methodology the net peak areas are crucial for extracting and interpreting of the spectral information on the radioisotopes present in the assaying sample. Thus, traditional net peak area based algorithms can be very sensitive to the statistical quality of the measured spectrum and counting efficiency of the detectors [12,13].…”

“…Performance assessment of the net peak area based algorithms for uranium enrichment determination tasks using CZT and LaBr 3 (Ce) with their limits and possibilities is described in detail in our previous comprehensive research [12,13]. To overcome the conceptual deficiencies of the traditional net peak area based algorithms other methods for qualitative and quantitative information extraction can be used.…”

Performance assessment of a 500 mm3 CZT and a 2x2 inch LaBr3(Ce) detectors for the determination of the uranium enrichment using the enrichment-meter method and calibration standards for safeguards applications

“…Results of that work indicated a promising performance of LaBr 3 (Ce) detectors for such tasks after the necessary modifications to the analysis and spectral information extraction routines are introduced to account for the physical and statistical particularities of LaBr 3 (Ce) measured uranium spectra. Performance assessment of a 500 mm 3 CZT detector of a quasi-hemispherical design with an isotopic ratios method for uranium enrichment determination tasks is provided in (Meleshenkovskii et al, 2018b). Application of CZT and LaBr 3 (Ce) detectors for uranium enrichment determination tasks using the enrichment-meter method is discussed in (Vo, 2006; Berndt and Mortreau, 2017).…”