The immediate product of decaying uranium-238 is lead-206 a, Ask an Expert

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The immediate product of decaying Uranium-238 is Lead-206. A sample containing a mixture of Lead-206 and Uranium-238 is made up of 18.56% Lead-206.

The half-life of Uranium-238 is 4.5e9 years. Assuming this started out as pure Uranium-238, how long has this been decaying (in years)?

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