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Comparative U, Np and Pu M edge high energy resolution X-ray absorption spectroscopy (HR-XANES) investigations of model and genuine active waste glass

Bahl, S.; Koldeisz, V.; Bohnert, E.; Gonzalez-Robles, E.; Schild, D. ORCID iD icon; Kienzler, B.; Kvashnina, K. O.; Rothe, J. ORCID iD icon; Dardenne, K. ORCID iD icon; Boshoven, J.; Martel, L.; Pidchenko, I.; Prüssmann, T. ORCID iD icon; Roth, G.; Geckeis, H.; Vitova, T. ORCID iD icon


Understanding the long term behavior of vitrified nuclear waste requires a full and detailed characterization of the materials including their characteristics as synthesized and after exposure to groundwater. Genuine radioactive waste glass has a complex chemical composition. Therefore we take a simplified approach by investigating and comparing the oxidation states of U, Pu and Np in high level waste (HLW) glass sampled from the VEK vitrification process (VEK glass) and in model glasses. The model glasses doped with U and Pu have the same borosilicate glass frit composition as the VEK glass, whereas the model glass doped with Np has a base glass composition (R7T7) typically used for vitrification of HLW in France. U/Pu/Np M4/M5 edge high energy resolution X-ray absorption near edge structure (HR-XANES) spectroscopy technique [1] is applied to characterize the An oxidation states in model and genuine VEK HLW glass. The HR-XANES analyses suggest predominant existence of U(VI) and Pu(IV) in the HLW and the model glasses as expected from the oxidative vitrification conditions. Weak changes in U oxidation state as a function of the U loading (1.2 – 5 wt% UO2) are discussed on the basis of U M4 edge HR-XANES and X-ray photoelectron spectroscopy (XPS) results. ... mehr

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DOI: 10.5445/IR/220103884
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Poster
Publikationsjahr 2015
Sprache Englisch
Identifikator urn:nbn:de:swb:90-AAA2201038840
KITopen-ID: 220103884
HGF-Programm 32.01.04 (POF III, LK 01) Entw.u.Anpassung v.Speziationsmethoden
Veranstaltung GDCh-Wissenschaftsforum Chemie 2015, Dresden, 30.August - 2.September 2015
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