Abstract
Abstract Specimens of Ca2Nd8(SiO4)6O2 were doped with 1.2 wt% 244Cm and the effects of self-radiation damage from alpha decay were determined as a function of cumulative dose. The macroscopic volume of the specimens increased exponentially with dose to a limiting (saturation) value of ∼8.0%. The initially crystalline material became completely X-ray amorphous at a dose of 11.7 × 1024 alpha decays/m3. The dissolution rate of the amorphous state was about an order of magnitude higher than the crystalline state. The stored energy of the amorphous state was ∼130 J/g. Differential thermal analysis along with isochronal and isothermal-step annealing were used to study the kinetics associated with the thermal recovery of the radiation-induced swelling and amorphization. A single recovery stage associated with recrystallization of the amorphous material was observed and the activation energy was determined to be 3.1±0.2 eV.
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