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A rock contains 200. µmol 238U (t1/2 = 4.5 109 yr) and 116 µmol 206Pb. Assuming that all the 206Pb comes from decay of the 238U, estimate the rock's age.

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I just worked this for Martin. If you're Martin, here it is again.
http://www.jiskha.com/display.cgi?id=1323291301

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