![]() ![]() ![]() To date an object, scientists measure the quantity of parent and daughter isotope in a sample, and use the atomic decay rate to determine its possible age.įor example, in the 238U- 206Pb series, 238U is the parent isotope and the others are daughter isotopes. Radiometric dating is based on the decay rate of these isotopes into stable nonradioactive isotopes. ![]() Many atoms (or elements) exist as numerous varieties called isotopes, some of which are radioactive, meaning they decay over time by losing particles. Parent and daughter isotopes commonly used to establish ages of rocks.
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