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Radiocarbon dating (or simply carbon dating) is a technique that uses the decay of carbon-14 (14C) to estimate the age of organic materials, such as wood and leather, up to about 58,000 to 62,000 years.[1] Carbon dating was presented to the world by Willard Libby in 1949, for which he was awarded the Nobel Prize in Chemistry.[2] Since its introduction it has been used to date many well-known items, including samples of the Dead Sea Scrolls, the Shroud of Turin, enough Egyptian artifacts to supply a chronology of Dynastic Egypt,[3] and Ötzi the Iceman.[4]
The dating method is based on the fact that carbon is found in various forms, including the main stable isotope (12C) and an unstable isotope (14C). Through photosynthesis, plants absorb both forms from carbon dioxide in the atmosphere. When an organism dies, it contains a ratio of 14C to 12C, but, as the 14C decays with no possibility of replenishment, the ratio decreases at a regular rate (the half-life of 14C). The measurement of 14C decay provides an indication of the age of any carbon-based material (a raw radiocarbon age).[5] However, over time there are small fluctuations in the ratio of 14C to 12C in the atmosphere, fluctuations that have been noted in natural records of the past, such as sequences of tree rings and cave deposits. These records allow for the fine-tuning, or calibration, of the indications derived from measuring the carbon ratio. A raw radiocarbon age, once calibrated, yields a calendar date.
One of the most frequent uses of radiocarbon dating is to estimate the age of organic remains from archaeological sites.

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