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Solar radiation effects in lunar samples.

B W Hapke, A J Cohen, W A Cassidy

    Science (New York, N.Y.)
    |January 30, 1970
    PubMed
    Summary
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    Pulverized Apollo 11 crystalline rocks show different optical properties than lunar soil. Irradiation and heating altered these properties, causing significant deviations in soil albedo and spectrum from expected values.

    Area of Science:

    • Geology
    • Planetary Science
    • Materials Science

    Background:

    • Lunar regolith optical properties are crucial for understanding surface processes.
    • Apollo 11 samples provide insights into lunar geology and material evolution.

    Purpose of the Study:

    • To investigate the optical properties of pulverized Apollo 11 crystalline rocks.
    • To determine the effects of environmental factors on these optical properties.
    • To compare rock and soil optical characteristics.

    Main Methods:

    • Analysis of optical properties (albedo, spectrum) of crystalline rock powders.
    • Exposure of samples to ultraviolet and X-ray irradiation.
    • Application of thermal treatments (heating).
    • Comparison with natural lunar soil properties.

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    Main Results:

    • Pulverized crystalline rocks exhibit distinct optical properties compared to lunar soil.
    • Irradiation and heating significantly altered the optical characteristics of the samples.
    • Observed albedo and spectral values of the treated soil deviated notably from predictions.

    Conclusions:

    • Environmental factors like irradiation and heat can modify lunar rock optical properties.
    • These modifications explain discrepancies between expected and observed lunar soil optical behavior.
    • Understanding these changes is vital for accurate remote sensing and surface interpretation.