FALLOUT STUDIES, CLOUD CHEMISTRY.
GENERAL DYNAMICS SAN DIEGO CALIF GENERAL ATOMIC DIV
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The measured absorptions per atmosphere between 1260 and 1400C of Cs, Ru, Sb, Te, and Mo in CaO-A12O3SiO2 samples with varying SiO2 content are, respectively, 0100 to 10000, 10, 10000, 1, and 100000 to 1000 times the ideal values as calculated by Miller. Attention is called to the effect of gaseous ions on chemistry occurring during fallout formation. Diffusivities of Cs, Sb, Te, and Mo are reported as determined in diffusion-limited evaporation studies and plane-source-technique studies. Variation of diffusivity of Sb with silicate composition was studied. Mass-spectrometric studies of the thermodynamics of vaporization of the alkaline earth oxides are reported. Gaseous species whose thermodynamic properties are reported were found to include M, MO, M2O, and M2O2 species. Microprobe studies of fallout particles revealed concentration gradients for many elements in fallout particles. A discussion is presented of the importance of thermodynamic properties of fission products and silicates and the kinetics associated with the fissionproduct absorption process, with particular emphasis on condensed-state diffusion and particle accretion events. Author