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Carbon dating is used to work out the age of organic material — in effect, any living thing.

The technique hinges on carbon-14, a radioactive isotope of the element that, unlike other more stable forms of carbon, decays away at a steady rate.

Later called Ötzi the Iceman, small samples from his body were carbon dated by scientists.

The results showed that Ötzi died over 5000 years ago, sometime between 33 BC. 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 in all living organisms because it enters the food chain.

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While there are a number of answers to that question, most of which depend largely on the age and surroundings of the item, carbon dating is surely one of the most important.Since the 1960s, scientists have started accounting for the variations by calibrating the clock against the known ages of tree rings.date of organic material - but an approximate age, usually within a range of a few years either way.After death the amount of carbon-14 in the organic specimen decreases very regularly as the molecules decay. Climate records from a Japanese lake are set to improve the accuracy of the dating technique, which could help to shed light on archaeological mysteries such as why Neanderthals became extinct.

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