Hydrogen in Fusion First Wall Surfaces

The concentration at which deuterium implanted into the materials B, C, Si, TiC, TiB2, B4C, and VB2 saturates has been measured using nuclear microanalysis. The local mixing model for H saturation and isotopic replacement agree well with these data and yield H saturation concentrations close to .5 H/host atom ratio for the elemental samples and lower concentrations for the compounds. The local mixing model has also been used to model tritium buildup and isotope exchange in proposed first-wall materials for magnetic confinement fusion reactors. Two satatistical models are introduced to discuss the buildup to saturation.