Abstract
Out-of-pile tritium release experiments were performed for Li 2O polycrystalline powder (2–4 mm) irradiated by 2.2 MeV electrons to various absorbed doses up to 100 MGy and by thermal neutrons with a fluence of 10 1 7 neutron/m 2. The linear temperature increase of the electron-irradiated samples showed two tritium release peaks: first started at around 600 K with a maximum at 800 K and second appeared at around 950 K with the maximum approximately at 1200 K. It is thought that the tritium release at high temperatures is due to the thermal decomposition of LiT. The formation of LiD under the electron irradiation was investigated by using the diffuse-reflectance Fourier transform infrared (FTIR) absorption spectroscopy. The Li 2O powder was irradiated by electron accelerator under D 2 containing atmosphere (N 2 +10% D 2). A Specific absorption band for the Li 2O sample was observed at 668 cm − 1 and attributed to the Li–D stretching vibration.
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