Abstract
The radiation resistance of ceramics proposed for solidification of actinide-containing wastes is studied. Their main concentrators (for uranium) in the samples are phases with fluorite type structure (zirconolite, pyrochlore, murataite), and brannerite. The critical dose for the transition of the crystal lattice of these phases into an amorphous state under irradiation with 1 MeV Kr+ at room temperature was 3·1018 m–2 for zirconolite, (1.8–2.4)·1018 m–2 for pyrochlore, (1.7–1.9)·1018 m–2 for murataite, and 1.4·1018 m–2 for brannerite. The forms of murataite with 3-, 5-, and 8-fold motif of the fluorite cell all have close radiation resistance. These data make it possible to estimate the transition time of the murataite structure into the amorphous state to be 6–7 hundred yr and 6–7 thousand yr with hypothetical content of 239Pu in it of 10% and 1%, respectively. The same values of the radiation resistance were obtained previously for titanates with pyrochlore structure, which were proposed by American researchers as matrices for immobilization of excess weapons plutonium.
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