[1G08-10] Tritium Trapping

[1G08] Study of hydrogen trapping at non-metallic inclusions in metals by tritium tracer technique

*Yuji Hatano¹, Mizuki Nishimura¹ (1. Univ. of Toyama)

Keywords:Tritium, Tracer, β-rays, Characteristic X-rays

Metallic materials for practical use contain fine non-metallic inclusions such as oxides and sulfides. Dispersion of fine oxide particles is a widely employed technique to strengthen materials. These inclusions and dispersed particles may trap hydrogen isotopes and affect on their dissolution, diffusion and permeation behaviors. However, quantitative data such as trapping energy and capacity have been scarcely reported. In this study, tritium was introduced into Fe and Cu samples containing known amounts of sulfide and oxide particles. Then, hydrogen trapping was examined by comparing intensity of beta-ray induced characteristic X-rays of constituent elements of inclusions/particles to that of the matrix element. The enrichment of hydrogen at sulfide inclusions in Fe was clearly observed.