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Investigation of dominant factors accelerating corrosion under gamma-ray irradiation

ガンマ線照射下で腐食を促進する支配因子の調査

小河 浩晃; 井岡 郁夫

Ogawa, Hiroaki; Ioka, Ikuo

本件は、ガンマ線照射下の腐食促進機構の解明を目的として研究を実施している。ガンマ線照射は量子科学技術研究開発機構(QST)の$$^{60}$$Co照射施設を利用し、照射時間は30minとした。照射中、水のpHは減少し、電気伝導率は増加する傾向を示した。照射試験後の水中の過酸化水素濃度は3.5$$times$$10$$^{-4}$$ wt%であった。10wt%以下の過酸化水素濃度では、その濃度が増加するにしたがって、pHは減少した。しかしながら、3.5$$times$$10$$^{-4}$$ wt%ではpHを減少させることはできないことから、照射中の水のpHの減少は、過酸化水素起因ではないことを示した結果と考えられる。

The objective of our research is to clarify corrosion acceleration mechanism of materials under the gamma-ray radiation environment. The irradiation experiment was conducted for 30 mins at the gamma-ray irradiation facility of Takasaki Advanced Radiation Research Institute of QST. During the gamma-ray irradiation, pH decreases, and also the electric conductivity showed a tendency to increase. The concentration of hydrogen peroxide in water was measured after irradiation and was about 3.5$$times$$10$$^{-4}$$ wt%. When the concentration is less than 10 wt%, the pH value decreases with increasing the concentration. A pH of 3.5$$times$$10$$^{-4}$$ wt% hydrogen peroxide water was 5.58. This was almost same as the pH value (5.56) of purified water. It seems that the decrease of pH after irradiation is not able to explain by the production of hydrogen peroxide.

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