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27-Feb-2021 00:48

A plot is constructed of Pb-206/Pb-204 versus Pb-207/Pb-204.

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See the Isochron Dating FAQ or Faure (1986, chapter 18) for technical detail.

The higher the uranium-to-lead ratio of a rock, the more the Pb-206/Pb-204 and Pb-207/Pb-204 values will change with time.