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Dating uranium

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In rubidium–strontium dating, micas exclude strontium when they form, but accept much rubidium.In uranium–lead (U–Pb) dating of zircon, the zircon is found to exclude initial lead almost completely.The sample age is based on the difference between the initial ratio of U with the environment (i.e., that it is a closed system.) The method is used for samples that can retain Uranium and Thorium, such as carbonate sediments, bones and teeth.

As uranium decays radioactively, it becomes different chemical elements until it stops at lead.The four isotopes are uranium-235, uranium-238, lead-207, and lead-206.The process of dating finds the two ratios between uranium-235 and lead-207; and uranium-238 and lead-206.The lead incorporated within the of uranium and thorium isotopes.Thus, the lead isotopic composition of any mineral or rock depends upon its age and the environment from which it was formed; that is, it would depend upon the ratio of uranium plus thorium to lead in the parent material.U at the time of sample formation must be known or calculated.