[1A12-15] Neutron Multiplier and Solid Breeder Materials

[1A14] Effect of irradiation dose on tritium release behavior of neutron irradiated Li₂TiO₃-Li₄SiO₄ mixed ceramic

*Qilai Zhou^1,2, Asahi Sanfukuji¹, Tan Guangfan^1,3, Oya Yasuhisa¹ (1. Shizuoka Univ., 2. Wuhan Univ. of Technol., 3. The Univ. of Sci. and Technol. Beijing)

Keywords:Tritium breeder, Nuclear fusion, Neutron irradiation, Hydrogen isotope, Lithium ceramic

Li2TiO3-Li4SiO4 is considered as the candidate tritium breeding material. In this study, neutron irradiation with different flux and fluence was performed. The tritium release behavior was investigated by thermal desorption spectroscopy (TDS) and isothermal heating experiment. It was found that the TDS spectra shifted to low-temperature side at high neutron fluence. With the decrease in neutron flux, the shape of TDS spectra became wider and the release peaks increased. Besides, the simulated TDS spectra based on the diffusion model and trapping / de-trapping process can reflect the isothermal heating experiment results. Further, there was another tritium release peak after the finish of isothermal heating, which indicated that tritium remained inside the ceramic. Therefore, both the diffusion and trapping / detrapping processes should be considered.