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It can be used on objects as old as about 62,000 years. Atoms of the same element that have different numbers of neutrons are called isotopes. Most carbon on Earth exists as the very stable isotope carbon-12, with a very small amount as carbon-13.
Here’s an example using the simplest atom, hydrogen. Carbon-14 is an unstable isotope of carbon that will eventually decay at a known rate to become carbon-12.
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.