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Title: Distribution of Tritium in the Near Surface of Type 316 Stainless Steel

Abstract

The distribution of tritium in the near surface of stainless steel, type 316, has been measured using a combination of a ZnCl 2 wash and acid etching with diluted aqua regia. This method improves upon etching measurements reported in the literature: results show depth resolutions of ~10 nm using the diluted aqua regia. The ZnCl 2 wash results show very high surface concentrations (~1.5 x10 13 Bq/cm 3), which decreases by a factor of 10 6 after etching to a depth of ~10 um. Further, the tritium concentrations in the near surface (<10 um) of unmodified stainless-steel samples do not change significantly over the course of 233 days, which indicates a quasi-equilibrium state has been reached. Tritium migration to the surface from the subsurface region was measured by etching a sample, then storing it in air for 2 to 4 days. After storing in air, the surface concentrations increased a thousandfold and rapidly decreased to base levels after etching an additional ~2 um. Finally, these measurements indicate that perturbing the quasi-equilibrium concentration profile results in tritium migration to the surface in order to reestablish the prior equilibrium state.

Authors:
 [1];  [2];  [1]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  2. Univ. of Rochester, NY (United States). Lab. for Laser Energetics, and Dept. of Chemistry
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States). Laboratory for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1574235
Grant/Contract Number:  
NA0003856
Resource Type:
Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 75; Journal Issue: 8; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; tritium; type 316 stainless steel; acid etching

Citation Formats

Sharpe, M., Fagan, C., and Shmayda, W. T. Distribution of Tritium in the Near Surface of Type 316 Stainless Steel. United States: N. p., 2019. Web. doi:10.1080/15361055.2019.1644136.
Sharpe, M., Fagan, C., & Shmayda, W. T. Distribution of Tritium in the Near Surface of Type 316 Stainless Steel. United States. doi:10.1080/15361055.2019.1644136.
Sharpe, M., Fagan, C., and Shmayda, W. T. Thu . "Distribution of Tritium in the Near Surface of Type 316 Stainless Steel". United States. doi:10.1080/15361055.2019.1644136.
@article{osti_1574235,
title = {Distribution of Tritium in the Near Surface of Type 316 Stainless Steel},
author = {Sharpe, M. and Fagan, C. and Shmayda, W. T.},
abstractNote = {The distribution of tritium in the near surface of stainless steel, type 316, has been measured using a combination of a ZnCl2 wash and acid etching with diluted aqua regia. This method improves upon etching measurements reported in the literature: results show depth resolutions of ~10 nm using the diluted aqua regia. The ZnCl2 wash results show very high surface concentrations (~1.5 x1013 Bq/cm3), which decreases by a factor of 106 after etching to a depth of ~10 um. Further, the tritium concentrations in the near surface (<10 um) of unmodified stainless-steel samples do not change significantly over the course of 233 days, which indicates a quasi-equilibrium state has been reached. Tritium migration to the surface from the subsurface region was measured by etching a sample, then storing it in air for 2 to 4 days. After storing in air, the surface concentrations increased a thousandfold and rapidly decreased to base levels after etching an additional ~2 um. Finally, these measurements indicate that perturbing the quasi-equilibrium concentration profile results in tritium migration to the surface in order to reestablish the prior equilibrium state.},
doi = {10.1080/15361055.2019.1644136},
journal = {Fusion Science and Technology},
number = 8,
volume = 75,
place = {United States},
year = {2019},
month = {9}
}

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