Dating in geology may be relative or absolute. The basic equation of radiometric dating requires that neither the parent nuclide nor the daughter product can enter or leave the material after its formation. Have you ever wondered how science knows the age of a fossil? Creature Cast. However, local eruptions of volcanoes or other events that give off large amounts of carbon dioxide can reduce local concentrations of carbon and give inaccurate dates. This is well-established for most isotopic systems.
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Radiometric dating is also used to date archaeological materials, including ancient artifacts. If the half life of an isotope is known, the abundance of the parent and daughter isotopes can be measured and the amount of time that has elapsed since the "radiometric clock" started can be calculated.