SODIUM DIFFUSION AND LEACHABILITY IN SOME TYPES OF OXIDE CERAMICS
By the integral residual radioactivity method the diffusion coefficients of 22Na radionuclides at different temperatures were determined in Synroc, Synroc-like and Zirconolite ceramics by the integralresidual radioactivity method. In the temperature range 573-923 K sodium diffusion coefficients were found to be10-12-10-14 m2.s-1. The temperature dependences of sodium diffusion coefficients were calculated. It was shown that in time interval from1 to 49 days the sodium leachability from zirconolite ceramics was higher than from Synroc-like ceramics, produced in different ways. It was established that diffusion played the important role during the process of sodium leaching from the materials.