This work considers the effect of fission fragment damage on the structural integrity and dissolution of the CeO 2 matrix in water, as a simulant for the UO 2 matrix of spent nuclear fuel. For this purpose, thin films of CeO 2 on Si substrates were produced and irradiated by 92 MeV 129 Xe 23+ ions to a fluence of 4.8 × 10 15 ions/cm 2 to simulate fission damage that occurs within nuclear fuels along with bulk CeO 2 samples. The irradiated and unirradiated samples were characterised and a static batch dissolution experiment was conducted to study the effect of the induced irradiation damage on dissolution of the CeO 2 matrix. Complex restructuring took place in the irradiated films and the irradiated samples showed an increase in the amount of dissolved cerium, as compared to the corresponding unirradiated samples. Secondary phases were also observed on the surface of the irradiated CeO 2 films after the dissolution experiment.
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Popel et al. (2016) studied this question.
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