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Effect of chloride and bromide ion on the concentration of hydrogen peroxide produced from seawater radiolysis

海水の放射線分解により生成する過酸化水素の濃度に対する塩化物イオン及び臭化物イオンの影響

端 邦樹; 塙 悟史; 本岡 隆文; 塚田 隆

Hata, Kuniki; Hanawa, Satoshi; Motooka, Takafumi; Tsukada, Takashi

福島第一原子力発電所では事故後の対応として炉内や使用済燃料プールへの海水注入が実施された。注入された海水は放射線に曝されるため、水の放射線分解生成物が発生すると考えられる。放射線分解生成物の中でも過酸化水素(H$$_{2}$$O$$_{2}$$)は鉄鋼材料の腐食に影響を与える酸化剤である。本研究では、照射された海水中に発生する過酸化水素の濃度が海水中のどの成分によって決められるのかということを明らかにするため、$$gamma$$線照射した人工海水中のH$$_{2}$$O$$_{2}$$濃度を調べ、これまでのラジオリシス計算結果と比較検討した。個々の海水成分を添加した水溶液についても同様に調べ、H$$_{2}$$O$$_{2}$$生成に寄与する成分の同定を試みた。その結果、海水の放射線分解におけるH$$_{2}$$O$$_{2}$$の生成がCl$$^{-}$$とBr$$^{-}$$の照射下での振る舞いに起因することを示した。

Fukushima Daiichi Nuclear Power Plants experienced seawater injection into the cores and spent fuel pools as an emergent measure for a short period after the accident. The injected seawater was exposed to radiation, and radiolytic species were produced. Especially, hydrogen peroxide (H$$_{2}$$O$$_{2}$$) is known as an oxidant which affects corrosion of materials. In order to identify the important factor which results in the high concentration of H$$_{2}$$O$$_{2}$$ in seawater radiolysis, the concentrations of H$$_{2}$$O$$_{2}$$ in $$gamma$$-irradiated artificial seawater was measured and compared with the result of radiolysis calculation. Solutions containing some constituents of seawater were also measured to identify which ion affects H$$_{2}$$O$$_{2}$$ production of seawater radiolysis. The experimental results showed that the H$$_{2}$$O$$_{2}$$ production from seawater radiolysis is mainly attributed to reactions of Cl$$^{-}$$ and Br$$^{-}$$ in water radiolysis, though many kinds of ions are dissolved in seawater.

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