ИСТИНА

Recently actinide(IV) oxides (AnO2) nanoparticles (NPs) have increased their importance for environmental safety issues and the development of new technological schemes. The progress in high-precision methods of solid phase analysis has increased our understanding of the structures of actinides-based particles at the nanoscale. Actinide dioxides NPs of different crystallinity can be formed in solutions under various conditions. This study aims to determine the phase stability of actinide dioxides (PuO2, NpO2, ThO2) in the form of nanoparticles during aging in solutions. Experiments with a non-radioactive analog of actinide dioxide - CeO2 were also carried out. Solubility and phase transportations of AnO2 and CeO2 in pure solutions (without complexing agents), phosphate, and carbonate-containing media are studied to evaluate the possible aging pathways.