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Nondestructive elemental depth-profiling analysis by muonic X-ray measurement.

Kazuhiko Ninomiya1, Michael K Kubo2, Takashi Nagatomo3

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Researchers developed a new nondestructive elemental analysis method using muonic X-rays. This technique successfully profiled a gold coin, revealing elemental concentration changes with depth.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Particle Physics

Background:

  • Elemental analysis is crucial for materials science and technology.
  • Existing methods struggle with three-dimensional, nondestructive analysis of bulk materials.
  • A decade of research led to the development of a novel technique.

Purpose of the Study:

  • To introduce and validate a new nondestructive elemental depth-profiling method.
  • To demonstrate the capability of the dreamX (damageless and regioselective elemental analysis with muonic X-rays) technique.
  • To analyze the elemental composition of a valuable artifact nondestructively.

Main Methods:

  • Utilized a negative muon particle beam as a novel probe.
  • Employed high-energy muonic X-rays emitted after muon interaction within the material.
  • Performed elemental depth profiling on an old Japanese gold coin (Tempo-Koban) using a low-momentum muon beam.

Main Results:

  • Successfully achieved nondestructive elemental depth profiling.
  • Determined that the gold (Au) concentration in the coin gradually decreased with depth.
  • Quantified elemental distribution over a micrometer length scale.

Conclusions:

  • The developed muonic X-ray method is a promising tool for elemental analysis.
  • This technique is particularly suitable for analyzing valuable and sensitive samples, such as archeological artifacts.
  • Offers a new avenue for nondestructive, three-dimensional elemental analysis of bulk materials.