Suppose that a mineral body formed in an ancient cataclysm-perhaps the formation of the earth itself-originally contained the uranium isotope 238U (which has a half-life of 4.51 x 109 years) but no lead, the end product of the radioactive decay of 238U. If today the ratio of 238U atoms to lead atoms in the mineral body is 0.9, when did the cataclysm occur?
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