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A Sampling Method for Semi-Quantitative and Quantitative Electron Microprobe Analysis of Glass Surfaces

  • Jamie L. Weaver (a1), Joelle Reiser (a1), Owen K. Neill (a1), John S. McCloy (a1) and Nathalie A. Wall (a1)...

Abstract

The determination of the long-term stability and corrosion of vitrified nuclear waste is an important aspect of research for the U.S. Department of Energy (DOE). It is necessary to understand the rate and mechanisms of Nuclear Waste Glass (NWG) corrosion to determine whether or not the glassy matrix will be able to retain radionuclides for the required repository performance time period. Glass corrosion and the rate of glass corrosions is determined by both chemical and microscopy. Electron Microprobe Analysis (EPMA) is a common and powerful method utilized in the examination of the chemographic difference between corroded and uncorroded NGWs. In this work, two forms of quantitative and semi-quantitative EPMA methods are defined by optimizing the instruments counting statistics against a standard glass and NIST minerals that have compositions similar to the glasses under examination. Data collected on both the planar and cross-sectioned surfaces of an unaltered simulated NWG by Standard based Wavelength Dispersive Spectroscopy (WDS) was found to be comparable to the theoretical composition of the glass. Conventional standardless Energy Dispersive Spectroscopy (EDS) data collected on the same surfaces was not comparable. However, standard-based EDS analysis is shown to be able to discriminate between unaltered and corroded glass surfaces.

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Keywords

A Sampling Method for Semi-Quantitative and Quantitative Electron Microprobe Analysis of Glass Surfaces

  • Jamie L. Weaver (a1), Joelle Reiser (a1), Owen K. Neill (a1), John S. McCloy (a1) and Nathalie A. Wall (a1)...

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