[3G10-15] Fusion Reactor Components

[3G12] Gamma-ray irradiation effect on hydrogen isotope retention behavior in tungsten

*Asahi Yoshida¹, Markus Wilde², Wei Mao², Khiem Do Duy¹, Yoshio Ueda³, Takumi Chikada¹ (1. Shizuoka Univ., 2. UTokyo, 3. Osaka Univ.)

Keywords:Tritium, Tungsten, Retention, Irradiation, Gamma-ray

Accurate prediction and evaluation of hydrogen isotope retention in plasma-facing components are essential for fuel efficiency and safety of fusion reactors. The components are exposed to high-energy neutron and gamma-ray irradiation, and structural changes in the material due to irradiation may result in the formation of stable trapping sites for hydrogen isotopes, increasing the amount of the retention. We recently found that gamma-ray irradiation at room temperature promoted a decrease in hydrogen isotope concentrations in the ceramic coatings, indicating that the gamma-irradiation is promising as a hydrogen removal technique. In this presentation, we report the effect of gamma-ray irradiation on hydrogen isotope retention behavior in tungsten.