If the Earth’s interior were a simple and homogeneous reservoir with respect to the ratio of uranium to lead, a single sample extracted by a volcano would provide the time of extraction. No parent–daughter value for a closed system is involved, rather just a single isotopic measurement of lead viewed with respect to the expected evolution of lead in the Earth.Unfortunately the simplifying assumption in this case is not true, and lead model ages are approximate at best.This is true because uranium is continuously creating more lead.A lead-rich mineral formed and isolated early in Earth history would have a low lead-206 to lead-204 ratio because it did not receive subsequent additions by the radioactive decay of uranium.
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These isotopes did not come from radioactive decay in the system but rather formed during the original creation of the elements.
If a simple mineral is widespread in the geologic record, it is more valuable for dating as more units can be measured for age and compared by the same method.
Carbon dating instruments comments
These instruments count the number. show whether the given date is reliable. noted in carbon-14 dates. Carbon-14 dating cannot be used to date.…