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Related Experiment Videos

The proton microprobe: a powerful tool for nondestructive trace element analysis.

F Bosch, A El Goresy, B Martin

    Science (New York, N.Y.)
    |February 17, 1978
    PubMed
    Summary
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    A novel proton microprobe enables precise chemical analysis of lunar minerals, outperforming electron microprobes for trace element detection and complex sample compositions. This technology shows promise for biological sample analysis.

    Area of Science:

    • Geochemistry
    • Analytical Chemistry
    • Materials Science

    Background:

    • Elemental analysis of geological and extraterrestrial samples is crucial for understanding planetary formation and evolution.
    • Electron microprobes are standard tools but have limitations in detecting low-concentration trace elements and analyzing samples with diverse elemental compositions.

    Purpose of the Study:

    • To evaluate the capabilities of a proton microprobe for chemical analysis of small mineral grains.
    • To compare the performance of proton-induced x-ray emission (PIXE) with electron microprobe analysis (EMPA).
    • To explore the potential applications of proton microprobe technology in other fields, such as biology.

    Main Methods:

    • Utilized a proton microprobe to focus proton beams (up to 6 MeV) to a 2x2 micrometer spot size.

    Related Experiment Videos

  • Performed chemical analysis on small mineral grains within lunar samples using proton-induced x-ray emission (PIXE).
  • Compared the analytical performance with established electron microprobe techniques.

    • Main Results:

    • The proton microprobe successfully analyzed the chemical composition of lunar mineral grains.
    • PIXE demonstrated superior sensitivity for trace element detection compared to electron microprobe analysis.
    • The technique is effective for analyzing samples with a wide range of major and trace elements and atomic numbers.

    Conclusions:

    • Proton microprobe analysis is a powerful technique for detailed chemical characterization of geological materials, especially lunar samples.
    • It offers advantages over electron microprobes for trace element analysis and complex sample matrices.
    • The feasibility of applying proton microprobe analysis to biological samples is established.