# Define radioactive carbon dating
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[](http://bit.ly/FastDating18)
What dating methods are there? If you have a certain amount of aradioactive material, its half-life is the time it takes for half of thematerial you started out with to decay. Dordrecht: Kluwer Academic Publishers.\
Carbon-14 is constantly being added to the atmosphere. 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.\
**Enjoying EarthSky? Subscribe.** - If a molecule contains no detectable 14C it must derive from a petrochemical feedstock or from some other ancient source. The ratio of 14 C to 12 C in the atmosphere is taken as the baseline for the other reservoirs: if another reservoir has a lower ratio of 14 C to 12 C, it indicates that the carbon is older and hence that either some of the 14 C has decayed, or the reservoir is receiving carbon that is not at the atmospheric baseline.\
Detail of the Ötzi the Iceman's damaged hip. Copyright: South Tyrol Museum of Archaeology. Materials that originally came from living things, such as wood and natural fibres, can be dated by measuring the amount of carbon-14 they contain. For example, in 1991, two hikers discovered a mummified man, preserved for centuries in the ice on an alpine mountain. Later called Ötzi the Iceman, small samples from his body were carbon dated by scientists. Higher tier Carbon-14 is a radioactive isotope. It is found in the air in carbon dioxide molecules. The amount of carbon-14 in the air has stayed the same for thousands of years. There is a small amount of radioactive carbon-14 cabon all living datig because it enters the food chain. Once an organism dies, it stops taking in carbon-14. The carbon-14 it contained at the time of death decays over a long period of define radioactive carbon dating, and the radioactivity of the material decreases. The approximate time since the organism died can be worked out by measuring the amount of carbon-14 left in its remains compared to the amount in living organisms.
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