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Related Experiment Videos

Three-dimensional trace element analysis by confocal X-ray microfluorescence imaging.

Laszlo Vincze1, Bart Vekemans, Frank E Brenker

  • 1MiTAC, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium. laszlo.vincze@ua.ac.be

Analytical Chemistry
|November 13, 2004
PubMed
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A novel three-dimensional (3D) scanning micro X-ray fluorescence (XRF) technique offers enhanced depth analysis. This method provides high-resolution 3D elemental mapping, serving as an alternative to X-ray fluorescence tomography.

Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Geoscience

Background:

  • Scanning micro X-ray fluorescence (XRF) is a powerful elemental analysis technique.
  • Traditional 2D XRF lacks depth resolution, limiting detailed 3D sample characterization.
  • Advanced techniques are needed for in-situ, high-resolution 3D elemental mapping.

Purpose of the Study:

  • To introduce and evaluate a three-dimensional (3D) variant of scanning micro X-ray fluorescence (XRF).
  • To demonstrate the capability for depth profiling and 3D elemental analysis.
  • To provide an alternative to X-ray fluorescence tomography for complex sample analysis.

Main Methods:

  • Utilized a confocal excitation/detection setup with a polycapillary half-lens at the European Synchrotron Radiation Facility (ESRF).

Related Experiment Videos

  • Focused the incoming X-ray beam and the detector's acceptance volume to achieve high spatial resolution.
  • Employed XYZ linear scanning for 3D-XRF analysis and depth profiling.

    • Main Results:

    • Achieved a detection volume of 100-350 µm³ with sub-ppm detection limits and comparable sensitivities to 2D XRF.
    • Enabled depth scans with energy-dependent resolution of 10-35 µm across a 3-23 keV energy range.
    • Successfully analyzed solid inclusions in diamond and fluid inclusions in quartz, showcasing 3D elemental mapping capabilities.

    Conclusions:

    • The developed 3D scanning micro-XRF method provides a viable alternative to X-ray fluorescence tomography.
    • The technique offers significant advantages in reducing scattering and enabling detailed 3D elemental distribution analysis.
    • This advancement opens new possibilities for characterizing complex microstructures and inclusions in various materials.