A rock contains 037 mg of pb-206 and 095 mg of u-238 the
A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. The half-life of the decay series U-238 → Pb-206 is 4.5 x 109yr. Assuming no Pb-206 was present in the rock initially, how old is the rock?
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a rock contains 037 mg of pb-206 and 095 mg of u-238 the half-life of the decay series u-238 rarr pb-206 is 45 x 109yr
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