Record Details

Title:
Characterization of U(VI)-phases in corroded cement products by micro(μ)-spectroscopic methods
Abstract:
Cementation is an industrial scale conditioning method applied to fix and solidify liquid low and intermediate level radioactive wastes (LLW/ILW) prior to underground disposal in geological formations.To assist prognosis of the long-term safety of cemented waste, alteration of uranium doped cement productswas studied in chloride-rich solutions relevant for final LLW/ILW disposal in rock salt. After long-time exposure of the full-scale LLW/ILW simulates to concentrated NaCl and MgCl2 brines, solid samples were retrieved for chemical and mineralogical analysis with an emphasis on uranium speciation in the corroded cement matrix.Bulk and recent spatially resolved micro(μ) U L3-XAFS measurements point to the occurrence of a diuranate type U(VI) phase forming throughout the corroded cement monoliths. U-enriched hot spots with dimensions up to several tens of μm turn out to be generally X-ray amorphous
Imprint:
Bristol, IOP Publ., 2013
Journal Information:
J. Phys. Conf. Ser., 430, 012114 (2013)
ISSN:
1742-6588
1742-6596
External related publications:
10.1088/1742-6596/430/1/012114
WOS:000320464300114 (WOS)
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 Record created 2016-10-11, last modified 2017-11-02

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