Abstract
In this work, the oxidative corrosion of UO2 particles by molecular species produced by 4He2+ radiolysis of water (simulated by irradiation with a 4He2+ beam) has been investigated as a function of the absorbed dose under open and closed atmospheres. This work was carried out by coupling for the first time (1) characterization of the UO2 surface after oxidation, (2) analysis of H2 and H2O2 produced by water radiolysis, and (3) quantification of the uranium species leached into the solution during irradiation. Oxidation of the surface of the UO2 particles was characterized by Raman spectroscopy. H2 and H2O2 were analyzed by micro gas chromatography and UV–vis spectrophotometry, respectively. Inductively coupled plasma mass spectrometry was used to quantify the soluble uranium species released into the solution. The results showed that, when the ultrapure water above the UO2 particles was irradiated in an open atmosphere, metastudtite was formed on the UO2 surface, indicating its oxidation by the H2O2 produ...
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