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Updated: Nov 23, 2025

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Absolute X-ray energy measurement using a high-accuracy angle encoder.

Takahiko Masuda1, Tsukasa Watanabe2, Kjeld Beeks3

  • 1Research Institute for Interdisciplinary Science, Okayama University, Okayama, Japan.

Journal of Synchrotron Radiation
|January 5, 2021
PubMed
Summary

This study introduces a new X-ray photon energy measurement method using a Bond diffractometer for fast, in situ analysis. The novel technique achieves unprecedented accuracy, improving measurements by an order of magnitude.

Keywords:
X-ray diffractionenergy calibrationlattice constantsnuclear resonant scatteringrotary encoders

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Area of Science:

  • Nuclear Physics
  • Metrology
  • Materials Science

Background:

  • Accurate X-ray photon energy measurements are crucial for various scientific and industrial applications.
  • Existing methods may lack the speed, in situ capability, or precision required for certain applications.

Purpose of the Study:

  • To develop and demonstrate an absolute X-ray photon energy measurement method with enhanced accuracy and speed.
  • To validate the performance of the developed system using a well-characterized nuclear transition.

Main Methods:

  • Utilized a Bond diffractometer equipped with a reference silicon single-crystal plate.
  • Incorporated a high-accuracy angle encoder (SelfA) for precise angular measurements.
  • Performed repeated measurements of the first excited state of the potassium-40 nuclide.

Main Results:

  • Successfully measured the excitation energy of potassium-40 to be 29829.39(6) eV.
  • Achieved an accuracy one order of magnitude higher than previous measurements.
  • Demonstrated an estimated standard deviation uncertainty of 0.7 p.p.m. and a maximum deviation of 2 p.p.m.

Conclusions:

  • The developed Bond diffractometer system offers a prompt, rapid, and accurate in situ method for absolute X-ray photon energy measurements.
  • The system's performance validates its potential for high-precision metrology in nuclear physics and related fields.