In-situ measurements of tritium desorption from a vanadium alloy by β-ray-induced Χ-ray spectrometry (BIXS)

概要

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Thermal release of tritium from a vanadium alloy was investigated by means of β-ray-induced X-ray spectrometry (BIXS). The sample tested was a V-4Cr-4Ti alloy recrystallized by annealing at 1000 ?C for 2 h. A tritium gas diluted with hydrogen was characterized with a quadrupole mass spectrometer and a small ionization chamber, and the concentration of tritium was evaluated to be 0.14%. The sample was exposed to the tritium gas at 400 ?C. The total concentration of hydrogen isotopes absorbed in the sample was 0.17 at%, and the corresponding tritium concentration was 2.4 appm, respectively. Tritium started to desorb at 350 ?C. The duration of time required for desorption was much longer than that expected from the diffusion coefficient of tritium in the alloy, indicating that the rate of tritium release was controlled by a surface recombination process.
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