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Abstract
The diffusion of Ba in various carbons was investigated by electron microprobe analyzer.
The analysis was carried out on an instantaneous source experiment. Diffusion coefficients were obtained by three methods: (1) slope of log C vs. X 2, (2) total amount of diffusion sub- stances, and (3) coordinate of the point of inflexion in the concentration penetration curve. All methods gave values agreeing fairly well with each other. The diffusion coefficients and activation energies obtained were of the same order of the magnitude as the results obtained by other authors, and furthermore were in accord with the magnitude expected from the structure of impermeable carbons. The present method can therefore be considered as effective as out-pile tests for analyzing the diffusion mechanism of fission products.