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Chemical and structural investigations on uranium oxide-based microparticles as reference materials for analytical measurements

Kegler, Philip; Pointurier, Fabien; Rothe, Jörg; Dardenne, Kathy; Vitova, Tonya; Beck, Aaron; Hammerich, Simon; Potts, Shannon; Faure, Anne-Laure; Klinkenberg, Martina; Kreft, Fabian; Niemeyer, Irmgard; Bosbach, Dirk; Neumeier, Stefan

The analysis of individual micrometre- and submicrometre-sized particles collected by IAEA’s safeguards inspectors on swipe samples during in-field verification activities requires the implementation of a sustainable quality control system such as suitable microparticulate reference materials. To this end, pure and neodymium-doped uranium oxide-based microparticles utilising an aerosol-based particle production process were prepared. SEM/EDX measurements confirmed the monodispersity of the produced microspheres as well as the incorporation of 15 mol% Nd into the compound particles. The timeline of structural investigations mirror the ongoing alteration of particles being stored under laboratory atmosphere. While results from in-SEM Raman (CEA, DAM) on microparticles after two years storage time point to the formation of U3O8 and a minor fraction of schoepite phase (hydrated UO3), in U L3-edge XAFS after four months storage time and U M4-edge HR-XANES after ten months storage time spectra (INE-Beamline and ACT station @ KIT synchrotron radiation source) mainly U(IV) and U(V), respectively, was observed. These results provide new insight into ageing mechanism of the microparticles after preparation. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000129937
Veröffentlicht am 23.02.2021
DOI: 10.1557/s43580-021-00024-1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 02.2021
Sprache Englisch
Identifikator ISSN: 2059-8521
KITopen-ID: 1000129937
HGF-Programm 32.11.01 (POF IV, LK 01) Nuclear Waste Disposal
Weitere HGF-Programme 54.11.11 (POF IV, LK 01) Accelerator Operation, Research and Development
Erschienen in MRS advances
Verlag Cambridge University Press (CUP)
Vorab online veröffentlicht am 19.02.2021
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