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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.You can work out that after about 50 000 years of time, all the radiocarbon will have gone.
The archaeologist Colin Renfrew (1973) called it the development of this dating method 'the radiocarbon revolution' in describing its great impact upon the human sciences.
The job of a radiocarbon laboratory is to measure the remaining amounts of radiocarbon in a carbon sample.
This is very difficult and requires a lot of careful work to produce reliable dates.
Eventually, a particle is emitted from the carbon 14 atom, and carbon 14 disappears.
Most of the carbon on Earth exists in a slightly different atomic form, although it is chemically speaking, identical to all carbon.