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

    Research output: Contribution to journalArticle

    42 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Article numberL10201
    JournalGeophysical Research Letters
    Volume37
    Issue number10
    DOIs
    Publication statusPublished - 2010 May

    Fingerprint

    moon
    uranium
    Moon
    lunar maps
    gamma ray spectrometers
    highlands
    thorium
    spectrometer
    gamma rays
    energy
    distribution

    ASJC Scopus subject areas

    • Earth and Planetary Sciences(all)
    • Geophysics

    Cite this

    Yamashita, N., Hasebe, N., Reedy, R. C., Kobayashi, S., Karouji, Y., Hareyama, M., ... Kim, K. J. (2010). Uranium on the Moon: Global distribution and U/Th ratio. Geophysical Research Letters, 37(10), [L10201]. https://doi.org/10.1029/2010GL043061

    Uranium on the Moon : Global distribution and U/Th ratio. / Yamashita, N.; Hasebe, Nobuyuki; Reedy, R. C.; Kobayashi, S.; Karouji, Y.; Hareyama, M.; Shibamura, E.; Kobayashi, M. N.; Okudaira, O.; D'Uston, C.; Gasnault, O.; Forni, O.; Kim, K. J.

    In: Geophysical Research Letters, Vol. 37, No. 10, L10201, 05.2010.

    Research output: Contribution to journalArticle

    Yamashita, N, Hasebe, N, Reedy, RC, Kobayashi, S, Karouji, Y, Hareyama, M, Shibamura, E, Kobayashi, MN, Okudaira, O, D'Uston, C, Gasnault, O, Forni, O & Kim, KJ 2010, 'Uranium on the Moon: Global distribution and U/Th ratio', Geophysical Research Letters, vol. 37, no. 10, L10201. https://doi.org/10.1029/2010GL043061
    Yamashita N, Hasebe N, Reedy RC, Kobayashi S, Karouji Y, Hareyama M et al. Uranium on the Moon: Global distribution and U/Th ratio. Geophysical Research Letters. 2010 May;37(10). L10201. https://doi.org/10.1029/2010GL043061
    Yamashita, N. ; Hasebe, Nobuyuki ; Reedy, R. C. ; Kobayashi, S. ; Karouji, Y. ; Hareyama, M. ; Shibamura, E. ; Kobayashi, M. N. ; Okudaira, O. ; D'Uston, C. ; Gasnault, O. ; Forni, O. ; Kim, K. J. / Uranium on the Moon : Global distribution and U/Th ratio. In: Geophysical Research Letters. 2010 ; Vol. 37, No. 10.
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