Uranium on the Moon: Global distribution and U/Th ratio

N. Yamashita*, Nobuyuki Hasebe, R. C. Reedy, S. Kobayashi, Y. Karouji, M. Hareyama, E. Shibamura, M. N. Kobayashi, O. Okudaira, C. D'Uston, O. Gasnault, O. Forni, K. J. Kim

*この研究の対応する著者

    研究成果査読

    50 被引用数 (Scopus)

    抄録

    The Kaguya Gamma-Ray Spectrometer uniquely identified uranium gamma-ray lines from the Moon with a superior energy resolution of ∼1%. A global lunar map of uranium distribution is derived for the first time. It was found that uranium abundances vary up to 2 ppm with an average of ∼0.3 ppm, while the average thorium abundance was ∼1.2 ppm. From these analyses, significant variation in U/Th ratio was found in the farside of the Moon that had not been reported by previous observations or in lunar materials. Our observations suggest that the lunar highland is not as uniform as has been long considered.

    本文言語English
    論文番号L10201
    ジャーナルGeophysical Research Letters
    37
    10
    DOI
    出版ステータスPublished - 2010 5

    ASJC Scopus subject areas

    • 地球惑星科学(全般)
    • 地球物理学

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