Influence of Heat Treatments on the Near-Surface Tritium Concentration Profiles

Sharpe, M.; Shmayda, W. T.; Ruby, J. J.

doi:10.1109/tps.2022.3200864

Influence of Heat Treatments on the Near-Surface Tritium Concentration Profiles

Journal Article · Tue Sep 13 00:00:00 EDT 2022 · IEEE Transactions on Plasma Science

DOI:https://doi.org/10.1109/tps.2022.3200864· OSTI ID:1923919

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Univ. of Rochester, NY (United States); Laboratory for Laser Energetics, University of Rochester
Univ. of Rochester, NY (United States)

Austenitic stainless steel, type 316, absorbs significant quantities of tritium into the near surface (<1 μm) on exposure to tritium containing gases at room temperature. The tritium concentrations that develop in the near-surface region (<1 μm) are shown to persist for several years without changing. The current work shows the effect of heat treatments on the near-surface tritium-concentration profiles in stainless steel. Identical stainless-steel samples were exposed to tritium at room temperature and then were heated to different temperatures between 100 and 300°C for two hours under a stagnant argon atmosphere. After this initial preheating, the concentration profiles in the first 10 μm were measured by using a combination of a ZnCl2 wash and an etching procedure. Tritium was thermally released by heating the samples to 550°C to measure the residual tritium present in the bulk of the sample. The data show two dominant features. First, preheating causes tritium to migrate both out of the sample and deeper than >1 μm into the bulk. Furthermore, this effect increases with increasing temperature. Second, depletion of tritium from the near surface does not occur until a temperature of 200°C.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003856

OSTI ID:: 1923919

Journal Information:: IEEE Transactions on Plasma Science, Journal Name: IEEE Transactions on Plasma Science Journal Issue: 11 Vol. 50; ISSN 0093-3813

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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Influence of Heat Treatments on the Near-Surface Tritium Concentration Profiles

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