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The carbon 14 present in an organism at the time of its death decays at a steady rate, and so the age of the remains can be calculated from the amount of carbon 14 that is left. The cells of all living things contain carbon atoms that they take in from their environment.

Back in the 1940s, the American chemist Willard Libby used this fact to determine the ages of organisms long dead.

Carbon-13 and carbon-14 are thus isotopes of carbon-12.

View the full list Radiocarbon dating has transformed our understanding of the past 50,000 years.

When isotopes are to be designated specifically, the chemical symbol is expanded to identify the mass (for example, C is not stable.

As a result it is always undergoing natural radioactive decay while the abundances of the other isotopes are unchanged.

Most carbon atoms have six protons and six neutrons in their nuclei and are called carbon 12. But a tiny percentage of carbon is made of carbon 14, or radiocarbon, which has six protons and eight neutrons and is not stable: half of any sample of it decays into other atoms after 5,700 years.

Carbon 14 is continually being created in the Earth's atmosphere by the interaction of nitrogen and gamma rays from outer space.

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