In an old system (≫500 ky) a radioactive secular equilibrium is established between the parent 238U or 235U and their daughter radioisotopes. Uranium-238 and Uranium-235 are the parent isotopes of decay chains that can be used to provide a chronology back to ∼500 ky. Pike, in Encyclopedia of Analytical Science (Second Edition), 2005 Uranium-Series Dating
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