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Carbon-14, or radiocarbon, is a naturally occurring radioactive isotope that forms when cosmic rays in the upper atmosphere strike nitrogen molecules, which then oxidize to become carbon dioxide.Green plants absorb the carbon dioxide, so the population of carbon-14 molecules is continually replenished until the plant dies.Because atmospheric carbon 14 arises at about the same rate that the atom decays, Earth's levels of carbon 14 have remained fairly constant.Once an organism is dead, however, no new carbon is actively absorbed by its tissues, and its carbon 14 gradually decays.AMS is faster and needs a much smaller sample, but is more expensive.Also shown are views of bone preparation at the Waikato Radiocarbon Dating Laboratory.Though still heavily used, relative dating is now augmented by several modern dating techniques.

One rare form has atoms that are 14 times as heavy as hydrogen atoms: carbon-14, or C ratio gets smaller.Libby thus reasoned that by measuring carbon 14 levels in the remains of an organism that died long ago, one could estimate the time of its death.This procedure of radiocarbon dating has been widely adopted and is considered accurate enough for practical use to study remains up to 50,000 years old.Among the artifacts from the University of Chicago’s Oriental Institute that Prof.Willard Libby tested during the radiocarbon dating development process was this wood from an ancient Egyptian coffin.

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Note that, contrary to a popular misconception, carbon dating is not used to date rocks at millions of years old.

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