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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Published on: June 19, 2018

Differential phase contrast with a segmented detector in a scanning X-ray microprobe.

B Hornberger1, M D de Jonge, M Feser

  • 1Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794-3800, USA. hornberg@xray1.physcis.sunysb.edu

Journal of Synchrotron Radiation
|June 17, 2008
PubMed
Summary

This study introduces a novel silicon detector for X-ray microprobes, enabling simultaneous absorption and phase contrast imaging. This advancement offers superior imaging for light elements with reduced radiation dose.

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Area of Science:

  • Materials Science
  • Physics
  • Biotechnology

Background:

  • Scanning X-ray microprobes are essential for nanoscale investigations across various scientific fields.
  • Current microprobe techniques primarily rely on absorption and fluorescence contrast mechanisms.
  • Phase contrast imaging offers enhanced contrast for weakly absorbing structures, particularly at multi-keV photon energies, with a reduced radiation dose.

Purpose of the Study:

  • To develop a segmented charge-integrating silicon detector for simultaneous absorption and differential phase contrast imaging.
  • To enable the simultaneous acquisition of transmission and fluorescence data using a complementary fluorescence detector.
  • To assess the detector's performance across a wide range of photon energies, rates, and exposure times at synchrotron radiation sources.

Main Methods:

  • Development of a segmented charge-integrating silicon detector.
  • Integration of the detector with a fluorescence detector for multimodal data acquisition.
  • Operation of the detector at third-generation synchrotron radiation sources, specifically the Advanced Photon Source.
  • Imaging of specimens using both absorption and differential phase contrast at approximately 2 keV and 10 keV.

Main Results:

  • The developed silicon detector successfully provides simultaneous absorption and differential phase contrast.
  • The detector is compatible with fluorescence detection for combined transmission and fluorescence imaging.
  • Demonstrated superiority of phase contrast over absorption contrast for imaging light elements at 2 keV and 10 keV.
  • The detector operates effectively across a broad spectrum of experimental conditions at synchrotron beamlines.

Conclusions:

  • The novel silicon detector significantly enhances nanoscale imaging capabilities for X-ray microprobes.
  • Simultaneous phase contrast imaging provides superior contrast for light elements compared to traditional absorption methods.
  • This technology advances the investigation of diverse specimens in life, environmental, and materials sciences by offering high-contrast, low-dose imaging solutions.