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After the war he became very interested in peaceful applications of atomic science.He and two students first measured the "half-life" of radiocarbon.In the 1940s, scientists succeeded in finding out how long it takes for radiocarbon to disappear, or decay, from a sample of carbon from a dead plant or animal.Willard Libby, the principal scientist, had worked in the team making the nuclear bomb during World War 2, so he was an expert in nuclear and atomic chemistry.Libby later received the Nobel Prize in Chemistry in 1960 for the radiocarbon discovery.Today, there are over 130 radiocarbon dating laboratories around the world producing radiocarbon dates for the scientific community.

This means that its atomic structure is not stable and there is an uneasy relationship between the particles in the nucleus of the atom itself.Because carbon is very common on Earth, there are alot of different types of material which can be dated by scientists.Below is a list of the different kinds of materials which can be dated: Libby tested the new radiocarbon method on carbon samples from prehistoric Egypt whose age was known.You can work out that after about 50 000 years of time, all the radiocarbon will have gone.Therefore, radiocarbon dating is not able to date anything older than 60 or 70 000 years old.

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