SS316 ステンレス鋼のトリチウムの除染(3) : エッチングによる表面除染後のトリチウムの挙動

概要

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In order to understand the mechanism of tritium release from Type 316 stainless steel, surface tritium concentration was examined by β-ray-induced X-ray spectrometry (BIXS) for the specimen that was etched by acid. Before etching, the surface tritium concentration was 158 kBq/cm2, while it became 1.1 kBq/cm2 after etching. The surface tritium concentration was found to increase with time, and it became as large as 83 kBq/cm2 in 4,500 hours after etching. During this period, tritium chronic release was observed. The result should that tritium segregated from the bulk to the surface and SS316 surface was re-contaminated with time.
富山大学の論文