Uranium on the Moon: Global distribution and U/Th ratio
Uranium on the Moon: Global distribution and U/Th ratio
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DOI：
10.1029/2010gl043061
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发表时间：
2010-05
影响因子：
5.2
通讯作者：
N. Yamashita;N. Hasebe;Robert C. Reedy;S. Kobayashi;Y. Karouji;M. Hareyama;E. Shibamura;M. Kobayashi;O. Okudaira;C. d'Uston;O. Gasnault;O. Forni;K. Kim
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文献类型：
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作者：
N. Yamashita;N. Hasebe;Robert C. Reedy;S. Kobayashi;Y. Karouji;M. Hareyama;E. Shibamura;M. Kobayashi;O. Okudaira;C. d'Uston;O. Gasnault;O. Forni;K. Kim
Kaguya 伽马射线光谱仪以 ~1% 的卓越能量分辨率独特地识别了来自月球的铀伽马射线线。首次绘制了全球月球铀分布图。研究发现，铀丰度变化最大为 2 ppm，平均为 ∼0.3 ppm，而钍的平均丰度为 ∼1.2 ppm。根据这些分析，在月球背面发现了 U/Th 比值的显着变化，这是之前的观测或月球材料中没有报告过的。我们的观察表明，月球高地并不像长期以来认为的那样均匀。
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.