Calibrated dates should also identify any programs, such as OxCal, used to perform the calibration.
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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.
Thus Carbon is found in very low levels in the fossil fuels produced from plants and the animals that eat them.
Description: Carbon dating is unreliable for objects older than about 30, years, but uranium-thorium dating may be possible for objects up to half a million years old, Dr. He is credited to be the first scientist to suggest that the unstable carbon isotope called radiocarbon or carbon 14 might exist in living matter.