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Then, the amount of each nuclide present in the rock sample must be measured.Each radioactive clock consists of a radioactive nuclide and its daughter product, which accumulate within the atomic framework of a mineral.

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Geochronology is the science of determining the age of rocks and minerals.In the 1650s, the Irish clergyman and scholar James Ussher (1581s history until mass spectrometers became available in the 1950s.The mass spectrometer is an instrument used to separate different varieties of atoms from each other.Before that time, inferences were made by comparing the rock record from different parts of the world and estimating how long it would take natural processes to form all the rocks on Earth.Georges Louis Leclerc de Buffon (17071788), for example, calculated Earth to be 74,832 years old by figuring how long it would take the planet to cool down to the present temperature.

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