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Improvement of effective solid angle using virtual-pivot holder and large EDS detector.

Shogo Koshiya1, Koji Kimoto1

  • 1Electron Microscopy Group, Research Center for Advanced Measurement and Characterization, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.

Micron (Oxford, England : 1993)
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A novel specimen holder design significantly improved the effective solid angle for silicon drift detectors, minimizing shadowing effects for enhanced X-ray spectroscopy. This advancement enables near-nominal solid angles and low system noise with plastic holders.

Keywords:
Energy-dispersive X-ray spectroscopyLarge solid angleSilicon drift detector

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Physics

Background:

  • Silicon drift detectors (SDDs) are crucial for X-ray spectroscopy.
  • Maximizing the effective solid angle is key to improving detector performance.
  • Specimen holders can introduce shadowing, reducing the collected X-ray signal.

Purpose of the Study:

  • To enhance the effective solid angle of a large-area silicon drift detector.
  • To investigate the impact of specimen holder design on X-ray spectral measurements.
  • To demonstrate a shadowing-free mechanical system for improved X-ray detection.

Main Methods:

  • Utilized a large-area silicon drift detector.
  • Employed a virtual-pivot double-tilt specimen holder.
  • Measured Energy-Dispersive X-ray (EDX) spectra with various holders and specimens.
  • Calculated effective solid angles from EDX spectral data.

Main Results:

  • The virtual-pivot mechanism reduced shadowing effects.
  • Effective solid angles approaching the nominal 0.464 sr were achieved.
  • Demonstrated the suitability of plastic (polyetheretherketone) specimen holders for low system noise.

Conclusions:

  • The virtual-pivot double-tilt specimen holder significantly improves effective solid angle in EDX spectroscopy.
  • Shadowing-free designs are critical for maximizing X-ray signal collection.
  • Plastic specimen holders offer a viable option for low-noise applications in X-ray analysis.