Fissile mass quantification in radioactive waste packages using photofission delayed gamma rays
| Autor: | Stephane Plumeri, Bertrand Perot, E. Simon, Fanny Jallu |
|---|---|
| Přispěvatelé: | CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA) |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Delayed gamma rays Semiconductor detectors chemistry.chemical_element [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] Spectroscopic analysis 010403 inorganic & nuclear chemistry 01 natural sciences Feasibility studies Nuclear physics Photofission Isotopes Radioactive wastes Delayed gammas 0103 physical sciences Irradiation MCNPX Isotope Isotopes of uranium Fissile material Germanium 010308 nuclear & particles physics Gamma rays Radiochemistry High energy photons Gamma ray Radioactive waste Uranium 0104 chemical sciences Radioactivity chemistry Nuclear fuels Fission reactions Radioactive waste packages High-resolution spectroscopy Detection limits Medical imaging Radioactive waste package |
| Zdroj: | 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD) 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD), Oct 2016, Strasbourg, France. pp.1-4, ⟨10.1109/NSSMIC.2016.8069819⟩ |
| DOI: | 10.1109/nssmic.2016.8069819 |
| Popis: | International audience; This paper reports a feasibility study, performed by numerical simulation with MCNPX, of fissile mass characterization in dense, large volume, long-lived and medium activity radioactive waste packages, using photofission delayed gamma rays. High-energy photon interrogation with a 15 MeV LINAC has been modelled for a 1.18 m3 cemented waste package, coupled to high resolution spectroscopy with a HP Ge detector. The study was carried out by assessing the passive and active backgrounds respectively due to the waste package gamma emission, and to material activation during irradiation, in view to determine the detection limits for the main delayed gamma rays of interest. The obtained detection limits are lower than the expected uranium mass in the waste package. On the other hand, as the photofission signal results from both fissile 235U and fertile 238U isotopes, a method for uranium isotopes discrimination based on gamma-ray ratios has been evaluated, showing that photofission delayed gamma rays could be used to assess the fissile mass as well as the total uranium mass. |
| Databáze: | OpenAIRE |
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