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Detection of Fission Coincidences With Plastic Scintillators for the Characterization of Radioactive Waste Drums

hal.structure.identifierCEA Cadarache
dc.contributor.authorBOTTAU, Vincent
hal.structure.identifierCEA Cadarache
dc.contributor.authorCARASCO, Cedric
hal.structure.identifierCEA Cadarache
dc.contributor.authorPEROT, Bertrand
hal.structure.identifierCEA Cadarache
dc.contributor.authorELEON, Cyrille
hal.structure.identifierCEA Cadarache
dc.contributor.authorDE STEFANO, Roberto
hal.structure.identifierCEA Cadarache
dc.contributor.authorISNEL, Lise
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorTSEKHANOVICH, Igor
dc.date.accessioned2023-11-20T16:50:06Z
dc.date.available2023-11-20T16:50:06Z
dc.date.issued2022
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/185069
dc.description.abstractEnThis work addresses the use of plastic scintillators as an alternative to 3He neutron detectors for radioactive waste drum characterization. The time response of scintillators is three orders of magnitude faster than that of gas proportional counters, and they offer similar neutron detection efficiency at lower cost. However, they are sensitive to gamma rays and the neutron-gamma pulse shape discrimination (PSD) is not possible with standard PVT scintillators. The proposed approach uses the neutron and gamma times of flight in triple coincidences recorded with 252Cf, AmBe, and 60Co sources. A 2-D histogram of time delays between the second and first detected pulses, on the x -axis, and between the third and second pulses, on the y -axis, evidences a specific region of interest for spontaneous fission coincidences. MCNPX-PoliMi simulations are performed, which are in good agreement with previous experiments and allow for investigating the types of coincidences ( γγγ , nnn, γ nn, γγn ) and optimizing the rejection of neutron and gamma scattering crosstalk. The method was also experimentally tested with a 118-L mock-up drum filled with a metallic or an organic matrix, showing a correct estimation of the net fission signal up to an “alpha ratio” of 12 between fission and ( α ,n) neutron emissions. Matrix and localization effects were also measured, showing a sensitivity (useful signal per gram of 240Pueq) for a homogeneous distribution of plutonium in the iron matrix about three times larger than in the wood matrix, due to neutron slowing-down in the latter. This difference can be taken into account by the prior knowledge of the matrix characteristics or by neutron and gamma attenuation measurements. In contrast, in case of a point source with an unknown position in the matrix, the relative localization uncertainty is 26% for the metallic drum, and 41% for the organic one.
dc.language.isoen
dc.title.enDetection of Fission Coincidences With Plastic Scintillators for the Characterization of Radioactive Waste Drums
dc.typeArticle de revue
dc.identifier.doi10.1109/tns.2022.3144346
dc.subject.halPhysique [physics]
bordeaux.journalIEEE Trans.Nucl.Sci.
bordeaux.page818-824
bordeaux.volume69
bordeaux.hal.laboratoriesCentre d'Études Nucléaires de Bordeaux Gradignan (CENBG)*
bordeaux.issue4
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionCNRS
bordeaux.peerReviewedoui
hal.identifierhal-03697197
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03697197v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=IEEE%20Trans.Nucl.Sci.&rft.date=2022&rft.volume=69&rft.issue=4&rft.spage=818-824&rft.epage=818-824&rft.au=BOTTAU,%20Vincent&CARASCO,%20Cedric&PEROT,%20Bertrand&ELEON,%20Cyrille&DE%20STEFANO,%20Roberto&rft.genre=article


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