Abstract
URANIUM–LEAD and thorium–lead ages for Apollo 11 and Apollo 12 lunar samples do not match and, furthermore, the dust samples seem to be older than the rocks. These experimental observations are generally thought to require some source of parentless lead1.
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References
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ADAMS, J., BARRETTO, P., CLARK, R. et al. Radon-222 Emanation and the High Apparent Lead Isotope Ages in Lunar Dust. Nature 231, 174–175 (1971). https://doi.org/10.1038/231174a0
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DOI: https://doi.org/10.1038/231174a0
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