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Report No.

Basic study on radiolysis of potassium nickel ferrocyanide

Arai, Yoichi  ; Watanabe, So  ; Takahatake, Yoko  ; Nakamura, Masahiro  ; Nomura, Kazunori  ; Nakajima, Yasuo  

Potassium nickel ferrocyanide (KNiFC) is one of the most effective adsorbents for decontamination of $$^{137}$$Cs in the radioactive waste solutions. Although the ferrocyanides are known to be chemically stable, HCN and H$$_{2}$$ gases are suspected to be generated by radiolysis. Generations of those gases should be suppressed or controlled in order to prevent hazards. In this study, $$gamma$$ ray irradiation experiment on KNiFC absorbing Cs was carried out to evaluate stability of used ferrocyanides. $$gamma$$ ray irradiation was performed using $$^{60}$$Co source, and the integrated dose was 0.13-6.0 MGy. After the irradiation, concentrations of H$$_{2}$$ gas, of CN$$^{-}$$ and of Cs were analyzed. G-value of H$$_{2}$$ calculated from the concentration of H$$_{2}$$ gas showed that generation of H$$_{2}$$ gas prompted by adding KNiFC into water. And the Cs charge in the compound did not influenced on the G-value. Therefore, concentration of H$$_{2}$$ gas in the tank for the used KNiFC has to be attenuated by ventilation. Although analyses on CN$$^{-}$$ and Cs revealed that KNiFC is stable up to 3 MGy irradiation, small amounts of them were observed in the liquid phase after 6 MGy irradiation.



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