Detailed MCNP Simulations of Gamma-Ray Spectroscopy Measurements With Calibration Blocks for Uranium Mining Applications

Abstract : AREVA Mines and the Nuclear Measurement Laboratory of CEA Cadarache are collaborating to improve the sensitivity and precision of uranium concentration evaluation by means of gamma-ray measurements. This paper reports gamma-ray spectra, recorded with two high-purity germanium detectors, on standard cement blocks with increasing uranium content, and the corresponding MCNP simulations. The detailed MCNP model of detectors and experimental setup has been validated by calculation vs. experiment comparisons. An optimization of detector MCNP models is presented in this paper, as well as a comparison of different nuclear data libraries to explain missing or exceeding peaks in the simulation. Energy shifts observed between the fluorescence X-rays produced by MCNP and atomic data are also investigated, as well as gamma backscattering and beta radiation effects. The validated numerical models will be used in further studies to develop new gamma-ray spectroscopy approaches aiming at reducing acquisition times, especially for ore samples with low uranium content.
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Submitted on : Wednesday, January 23, 2019 - 12:56:45 PM
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T. Marchais, B. Pérot, C. Carasco, P.-G. Allinei, P. Chaussonnet, et al.. Detailed MCNP Simulations of Gamma-Ray Spectroscopy Measurements With Calibration Blocks for Uranium Mining Applications. IEEE Transactions on Nuclear Science, Institute of Electrical and Electronics Engineers, 2018, 65 (9), pp.2533-2538. 〈10.1109/TNS.2018.2797312〉. 〈hal-01990707〉

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