Abstract
Release of hydrogen gases (H 2 , HT, T 2 ) and helium from highly neutron-irradiated Li-Al alloy on heating was investigated as functions of 6 Li burnup and temperature. Tritium gas (T 2 , HT) was released abruptly from the alloy at about 650 K. H 2 gradually above about 670 K, and He near the melting point of the alloy. The fraction of T 2 increased with 6 Li burnup. The highest specific activity of tritium in the gases obtained for the alloy of 65% 6 Li burnup was 1.98 PBq mol 1 , which nearly equals to a specific activity of pure tritium gas (2.14 PBq mol −1 ). The abrupt release of tritium at about 650 K may be owing to recovery of defects accompanied by recrystallization of the alloy. Negligible release of He below the melting point of the alloy is likely attributed to trapping of He at vacancies of the alloy.
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