Investigation of dominant factors accelerating corrosion under gamma-ray irradiation

Ogawa, Hiroaki  ; Ioka, Ikuo  

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 3.510 wt%. When the concentration is less than 10 wt%, the pH value decreases with increasing the concentration. A pH of 3.510 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.