Deuterium diffusion, trapping and release in ion-implanted beryllium

High purity beryllium samples were loaded with deuterium by ion-implantation at 25°C or by thermal absorption in D2 gas at 300–500°C. The samples were then thermally ramped up to 800°C at rates of 2–3°C/min, and the released deuterium measured as a function of temperature using a mass spectrometer. An alternative technique used was 3HeD nuclear reaction analysis, which measures the amount of deuterium retained in the near-surface (0–1 μm). …