Isotope Effects in Dynamic Behavior of Hydrogen in Fusion Reactor Materials Studied by Means of MeV Ion Beam ERD Technique.

Abstract Isotope effects in dynamic behaviors of hydrogen in fusion reactor materials are reviewed, which have been studied using MeV ion beam analysis technique. The merits of the ERD technique is addressed briefly in the introduction and the general mass balance equations for hydrogen atoms in free and trapped states are commonly described, under simultaneous H and D irradiation which have been used for the analysis of the experimental data obtained systematically under different conditions. The three different experimental results are presented: (1) the isotope effects in retention of hydrogen isotopes (H and D) implanted independently and simultaneously into graphite at room temperature, (2) the isotope effects in thermal re-emission of hydrogen isotopes (H and D) from WC layer covered graphite and (3) the isotope effects between exchanges of D-implant in oxide ceramics by H in H2O-vapor and vice versa. The three experimental data are demonstrated to be well reproduced using the mass balance equations. KEYWORDS: isotope effectsfusion reactor materialshydrogen isotopeseastic recoil detection techniquehydrogen recyclingtritium recoverytritium inventoryexperimental datamass balance equations