Quantitative SEM/EDS analysis of high-level waste glasses

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Silicate glass will be used to stabilize high-level radioactive wastes (HLW) for disposal in a geological repository. The chemical durability of waste glass in the repository will be determined by the nature and progress of the glass-water (underground water) reaction. Aqueous corrosion of HLW glasses is known to result in the chemical alteration of the glass surface and the formation of secondary phases. Accurate quantitative analysis the altered glass surface and the reaction products that form is important for understanding the reaction kinetics and mechanism of glass corrosion. SEM/EDS is a powerful tool to study the alteration of waste-disposal glasses ... continued below

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3 p.

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Luo, J.S.; Wolf, S. & Ebert, W. March 1, 1995.

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Silicate glass will be used to stabilize high-level radioactive wastes (HLW) for disposal in a geological repository. The chemical durability of waste glass in the repository will be determined by the nature and progress of the glass-water (underground water) reaction. Aqueous corrosion of HLW glasses is known to result in the chemical alteration of the glass surface and the formation of secondary phases. Accurate quantitative analysis the altered glass surface and the reaction products that form is important for understanding the reaction kinetics and mechanism of glass corrosion. SEM/EDS is a powerful tool to study the alteration of waste-disposal glasses through quantitatively characterizing the reaction products. It is able to detect trace elements at concentrations less than 1 wt.%: for example, Fig. 1 shows the uranium peaks detected by SEM/EDS of a typical simulated waste glass, which contains 0.25 wt.% uranium in the matrix glass according to ICP/MS analysis. Nickel (0.44 wt.%) and chromium (0.47 wt.%) peaks are also clearly distinguishable in the spectrum. However, quantitative analyses of glass compositions are complicated by the lack of well-characterized reference samples having known and homogeneous compositions for candidate waste glasses, which may contain a combination of more than 20 different elements in one matrix. It has been proposed that unreacted glass with known compositions could satisfactorily serve as standards for quantitative analysis of waste-disposal glasses and the secondary phases. The main advantage of using such standards is that they contain all the elements to be analyzed in the homogeneous vitreous matrices. In this paper, we evaluate several reference waste glasses with respect to their suitability as standard samples for quantitative SEM/EDS analysis. The precision and accuracy using such standards for quantitative analysis are also discussed. All the experiments were carried out on a Topeon ABT 60 SEM operating at 20 kV.

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3 p.

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INIS; OSTI as DE95014080

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  • 29. annual meeting of the Microbeam Analysis Society, Breckenridge, CO (United States), 6-11 Aug 1995

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  • Other: DE95014080
  • Report No.: ANL/CMT/CP--86025
  • Report No.: CONF-950865--4
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 83799
  • Archival Resource Key: ark:/67531/metadc788554

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • March 1, 1995

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  • Dec. 3, 2015, 9:30 a.m.

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  • Jan. 15, 2016, 12:09 p.m.

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Luo, J.S.; Wolf, S. & Ebert, W. Quantitative SEM/EDS analysis of high-level waste glasses, article, March 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc788554/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.