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DOI: 10.5445/IR/1000075554

Advanced chemical and structural Characterization of Nuclear Waste Materials related to the Nuclear Fuel Cycle

Bahl, Sebastian Peter

Abstract (englisch):
This dissertation reports structural and speciation investigations of simulated and genuine nuclear wastes. Chapters 4 and 5 emphasize on the very first application of the bulk U, Np and Pu M4,5 absorption edge high-energy resolution X-ray absorption near edge structure (HR XANES) method for characterization of U, Np and Pu oxidation states in model and genuine nuclear waste glasses and spent nuclear fuel (SNF). Chapters 6 and 7 address volatilization and precipitation challenges occurring during vitrification of fission products (FP) like Cs, Tc, Ru and Pd. Various approaches are discussed and potential solutions are proposed.
Chapter 4.1 describes the results from the studies of Pu doped borosilicate glasses. Pu(III), Pu(IV) and Pu(VI) are for the first time characterized simultaneously present in a borosilicate glass using Pu M5 edge HR-XANES. It is illustrated that the method can be very efficiently used to determine Pu oxidation states which control the solubility limit of Pu in a glass matrix. HR XANES results show that the addition of excess Si3N4 is not sufficient for complete reduction of Pu to Pu(III) which has a relativ ... mehr


Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Hochschulschrift
Jahr 2017
Sprache Englisch
Identifikator URN: urn:nbn:de:swb:90-755545
KITopen ID: 1000075554
Verlag Karlsruhe
Umfang XII, 216 S.
Abschlussart Dissertation
Fakultät Fakultät für Chemie und Biowissenschaften (CHEM-BIO)
Institut Institut für Nukleare Entsorgung (INE)
Prüfungsdatum 28.04.2017
Referent/Betreuer Dr. T. Vitova; Prof. H. Geckeis
Schlagworte HR-XANES, EXAFS, radioactive materials, spent nuclear fuel, nuclear waste glass, nuclear fuel cycle, vitrification, X-ray spectroscopy
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