He前照射タングステン材料にイオン照射したトリチウムの熱的挙動

概要

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Thermal behavior of tritium implanted in tungsten pre-irradiated with a given fluence of helium was examined by β-ray induced X-ray spectrometry (BIXS) under a condition of isochronal heating. To estimate changes in tritium distribution caused by heating, Ar(Kα) and W(Mα) X-rays were mainly utilized as probes of tritium detection. The intensity of the former X-rays linearly decreased with increase in heating temperature, while that of the latter X-rays was almost constant up to 600K and dramatically decreased above this temperature, indicating existence of strong trap sites. Such thermal behavior on X-ray intensity coincides with the understanding of thermal desorption spectra of deuterium. It was thought, therefore, that strong trap sites of tritium were due to the effects of bubbles generated by the helium pre-irradiation, and the trapping energy of tritium was estimated to be about 1.2 e.V. Moreover, change in depth profiles of tritium with heating was evaluated by analyzing the observed X-ray spectra by means of computer simulation, and changes in the concentration of tritium retained in surface layers were examined.