1. Materials Science and Technology Division Tritium Science and Technology Group Los Alamos National Laboratory, MS C348 Los Alamos/New Mexico, 87545 USA 505-667-1410
2. Department of Thermonuclear Fusion Research Japan Atomic Energy Research Institute Tokai Research Establishment, 319-22 Tokai-mura, Naka-gun, Ibaraki-ken, JAPAN 0292-82-5577