1. Tritium Engineering Laboratory Department of Thermonuclear Fusion Research Japan Atomic Energy Research Institute Tokai-mura, Naka-gun, Ibaraki-ken 319-11, Japan (0292) 82-6393
2. Tritium Science and Technology Group Material Science and Technology Division Los Alamos National Laboratory MS C348, Los Alamos, New Mexico 87545, U.S.A. (505) 667-1410