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Report No.

Effects of constituents of seawater on formation of volatile iodine by aqueous phase radiation chemistry

Hata, Kuniki ; Kido, Kentaro ; Nishiyama, Yutaka ; Maruyama, Yu 

Model calculations of radiolysis of seawater with iodide were carried out to predict effects of seawater constituents on iodine chemistry at the time of a severe accident. Through the calculations based on $$gamma$$-radiolysis of solutions at ambient temperature, it was found that the production of molecular iodine (I$$_{2}$$) was promoted by the addition of seawater constituents. Especially, Br$$^{-}$$ and HCO$$_{3}$$$$^{-}$$ had a large impact on its production. The production yields of radiolytic species were affected by the addition of I$$^{-}$$ as well. It was also shown that the pH of seawater is an important parameter to determine radiolytic conditions of iodine. These results imply the potential that the injection of seawater has significant impact on iodine source term.



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