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Related Experiment Video

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3D Imaging of Soft-Tissue Samples using an X-ray Specific Staining Method and Nanoscopic Computed Tomography
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A novel 3D absorption correction method for quantitative EDX-STEM tomography.

Pierre Burdet1, Z Saghi1, A N Filippin2

  • 1Department of Materials Science and Metallurgy, University of Cambridge, Charles Babbage Road 27, Cambridge CB3 0FS, Cambridgeshire, UK.

Ultramicroscopy
|October 21, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces a new 3D method to correct X-ray absorption in microanalysis. The technique accurately corrects for absorption artifacts in heterogeneous samples, improving elemental mapping accuracy.

Keywords:
3D chemical analysisAbsorption correctionElectron tomographyEnergy dispersive X-ray spectrometryQuantification

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Microscopy

Background:

  • Energy dispersive X-ray (EDX) microanalysis is crucial for elemental composition determination.
  • Absorption of X-rays in heterogeneous samples introduces significant artifacts, complicating accurate quantification.
  • Existing methods struggle with unknown sample structures and compositions.

Purpose of the Study:

  • To develop and validate a novel 3D method for correcting X-ray absorption in EDX microanalysis.
  • To address the challenges posed by heterogeneous samples with unknown structures.
  • To improve the accuracy of elemental quantification in complex materials.

Main Methods:

  • Utilized scanning transmission electron microscopy (STEM) combined with EDX.
  • Employed 3D reconstruction to map X-ray generation sites and paths.
  • Implemented a voxel-by-voxel absorption correction based on estimated local composition.

Main Results:

  • Demonstrated significant reduction of reconstruction artifacts caused by X-ray absorption.
  • Identified and corrected for incomplete oxide recovery and erroneous carbon presence in a core/shell nanowire.
  • Validated the method's accuracy using low-absorption X-ray lines.

Conclusions:

  • The novel 3D absorption correction method effectively mitigates artifacts in EDX microanalysis.
  • This technique enhances the reliability of elemental mapping for heterogeneous samples.
  • Accurate quantitative analysis of complex nanostructures is now more achievable.