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Uranyl minerals as models for storage of spent nuclear fuels

Baker, R.J.; Walshe, A.; Keyes, T.E.; Forster, R.J.; Prüßmann, T.; Pidchenko, I.; Vitova, T.

Abstract:
Storage of Spent Nuclear Fuels (SNF) in geological repositories is the favoured method for a number of EU countries. Under moist oxidising conditions, UO2 will likely oxidise to uranyl compounds via a number of phase changes. These have been characterised on the weathering of uranium ores and on the surface of UO2 and SNF [1]. These phases can sorb radionuclides such as neptunium and therefore alter the migration rates into the near-field. We will present our recent work on the characterisation of the unusual mineral studtite, [UO2(η2-O2)(H2O)2].2H2O, using solid-state electrochemistry [2] and X-ray spectroscopy (U L3-EXAFS and High Energy Resolution-XANES) [3] (Figure); both techniques have the potential to give important information on the electronic structure of actinide complexes but are not currently well utilised. We will discuss the use of Eu(III) as a model for Am in the sorption onto the surface of selected minerals, which has directed our efforts in 241Am(III) incorporations. These have been characterized by emission spectroscopy and γ-spectrometry using emission spectroscopy, and the reactions of 237Np(V) with selected mi ... mehr


Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Vortrag
Jahr 2015
Sprache Englisch
Identifikator KITopen ID: 230104275
HGF-Programm 32.27.04; LK 01
Erschienen in Symposium 'Catalysis and Sensing for our Environment', Dublin, IRL, July 9-10, 2015
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