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Volatility of a zinc borosilicate glass containing simulated high-level radioactive waste. [800 to 1200/sup 0/C] [report]

W.J. Gray
1976 unpublished
V o l a t i l i t i e s of a zinc borosilicate glass containing 25 w t . % simulated high-level radioactive waste calcine and of the calcine i t s e l f were determined in the range 800-1200°C. The fission products Rb, Mo, Ru, Te, and Cs were detected in the vapor from both the glass and the calcine. In general, the vaporization rates were lower from the glass with the exception of Rb and Cs a t 1200°C, where the rates were about the same from the glass as from the calcine. Furthermore, slopes
more » ... urthermore, slopes of Arrhenius plots f o r Rb and Cs were higher f o r the glass indicating t h a t more of these elements would be l o s t from the glass above 1200°C than from the calcine. Vaporization of a1 1 v o l a t i l e elements from the glass seems to be dominated by a single mechanism; thus, vapor composition over the glass i s e s s e n t i a l l y temperature independent. Several mechanisms apply t o vaporization of the various elements from the calcine. Gross weight-loss from the glass and calcine appears to be surface and diffusion controlled, respectively.
doi:10.2172/7341867 fatcat:ucuxl7b6ajembpv2dbqwy4tt6a