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Research has been ongoing since the 1960s to determine what the proportion of in the atmosphere has been over the past fifty thousand years.
The resulting data, in the form of a calibration curve, is now used to convert a given measurement of radiocarbon in a sample into an estimate of the sample's calendar age.
Scientists find the ratio of parent isotope to daughter isotope.
and is now the principal source of information about the absolute age of rocks and other geological features, including the age of fossilized life forms or the age of the Earth itself, and can also be used to date a wide range of natural and man-made materials.This process continues over time, with the organism losing half of the remaining C-14 isotopes each 5,730 years.Fossils are collected along with rocks that occur from the same strata.The rate at which a radioactive isotope decays is measured in half-life.The term half-life is defined as the time it takes for one-half of the atoms of a radioactive material to disintegrate.