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Related Experiment Videos

Approaches to "Standardless" Wavelength Dispersive Analysis.

Reed1

  • 1Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|April 1, 2000
PubMed
Summary

Standardless wavelength dispersive (WD) analysis in electron microprobe analysis is achievable by combining theoretical X-ray intensities with detector models. This method offers convenience but with reduced accuracy compared to traditional standards.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Geoscience

Background:

  • Electron microprobe analysis (EMPA) is crucial for elemental quantification.
  • Energy dispersive (ED) analysis utilizes standardless methods, but wavelength dispersive (WD) analysis faces challenges due to unknown spectrometer crystal reflectivity.

Purpose of the Study:

  • To explore the feasibility and methodology of standardless wavelength dispersive (WD) analysis in electron microprobe analysis (EMPA).
  • To address the limitations of traditional standard-dependent WD analysis.
  • To propose a practical approach for routine WD analysis without immediate standards.

Main Methods:

  • Calculating X-ray intensities from first principles.
  • Employing a detector efficiency model.

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  • Utilizing stored intensity data and interpolation for missing standards.
  • Applying empirical adjustment factors for spectrometer efficiency variations.
  • Implementing background corrections based on continuum intensities.

    • Main Results:

    • Standardless WD analysis is technically feasible by integrating theoretical calculations with detector models.
    • Stored intensity data and interpolation can mitigate the need for immediate standards.
    • Empirical adjustments and background correction methods can be adapted for standardless analysis.
    • The proposed method allows for convenient standardless analysis, albeit with a trade-off in accuracy.

    Conclusions:

    • Standardless WD analysis can be a practical alternative to standard-dependent methods in EMPA.
    • This approach offers convenience, particularly when high accuracy is not paramount or as a preliminary step.
    • Further refinement may be needed to enhance accuracy for critical applications.