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Uranium Series Chronology Laboratory----INSTITUTE OF GEOLOGY AND.

Secular equilibrium: A situation in which the quantity of a radioactive isotope remains constant because its production rate (due to decay of a parent isotope) is equal to its decay rate.These elements are usually present in constant (equilibrium) amounts in a sample, as long as the system remains closed.

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Secular equilibrium can only occur in a radioactive decay chain if the half-life of the daughter radioisotope is much shorter than the half-life of the parent radioisotope, as typical of the uranium series decay chains.


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