Abstract
Tritium gases (HT, T 2) and helium are released abruptly from highly neutron-irradiated Al–12.7 at.% 6Li alloy around 570 K on isochronal heating, and H 2 gradually above the same temperature. In the previous study of the neutron-irradiated Al–0.1 at.% 6Li alloy (J. Nucl. Mater. 139 (1986) 248), negligible release of helium at temperatures below the melting point of the alloy is attributed to trapping of helium at vacancies in the alloy. In this study, however, helium is released from the Al–12.7 at.% 6Li alloy at temperatures below the melting point of the alloy same as tritium. The origin of helium release is assumed to be the rupture of helium bubbles. Furthermore, radiometric method shows that most of tritium produced by 6Li(n, α)T reaction exists in the T − state in the alloy. According to the above fact, an appropriate temperature to extract tritium from the alloy is suggested.
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