Calculation of radionuclides ⁹⁰Sr and ²³⁹Pu releasing amount from melt glass

Assumed the melt glass consists of spheres with uniformly size and nuclides' content, the mathematical expression is deduced to calculate nuclide releasing rates. According to the glass dissolution rate measured by Livermore laboratory, the lower and upper dissolution rates of granitic melt glass are estimated to be 5.04 × 10^-7 g/(m²·d) and l.42 × 10^-4 g/(m²·d) at 25 ℃. The releasing rates and ratios of ⁹⁰Sr and ²³⁹Pu are calculated and from the result it can be concluded the radionuclide dissolution rate and ratio at high temperature stage is l0^4∼5 times higher than at normal temperature and that nuclides dissolution largely takes place at high temperature stage. The dissolution ratio of ⁹⁰Sr might between 0.3% and 65%, the dissolution ratio of ²³⁹Pu might between 0.5% and 82%. The key factors affecting nuclides release are temperature, glass dissolution rate and reactive surface area. (authors)