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Related Experiment Videos

Extralunar dust in apollo cores?

D J Barber, I Hutcheon, P B Price

    Science (New York, N.Y.)
    |January 29, 1971
    PubMed
    Summary
    This summary is machine-generated.

    High densities of nuclear tracks were found in lunar core silicate grains. This suggests either space irradiation of dust or a much higher iron-to-hydrogen ratio in solar particles.

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    Area of Science:

    • Planetary Science
    • Cosmic Ray Physics

    Background:

    • Micrometer-size silicate grains from lunar cores contain evidence of irradiation.
    • Nuclear track densities provide insights into particle bombardment history.

    Purpose of the Study:

    • To analyze nuclear track densities in lunar core silicate grains.
    • To investigate the origin of high irradiation levels.

    Main Methods:

    • Analysis of silicate grains from 12- and 60-centimeter lunar cores.
    • Measurement of nuclear track densities exceeding 10^11 per square centimeter.

    Main Results:

    • Several percent of silicate grains across all depths exhibit exceptionally high nuclear track densities.
    • Observed densities suggest significant irradiation events.

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    Conclusions:

    • The high track densities indicate either prior irradiation of these grains as extralunar dust in space.
    • Alternatively, the findings point to a solar particle composition with a significantly higher iron-to-hydrogen ratio than previously estimated for low-energy particles.