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For the most accurate work, variations are compensated by means of calibration curves.

The method was developed by Willard Libby and his colleagues at the University of Chicago in 1949.

(This, in turn, is caused by variations in the magnetic fields of the earth and sun, for example.) Although the ratio of radiocarbon to stable carbon in the atmosphere has varied over time, it is quite uniform around the globe at any given time because the atmosphere mixes very quickly and constantly.

Plants obtain all their carbon atoms from the atmosphere.

The ratio of radiocarbon to stable carbon atoms in the atmosphere has varied in the past.

what makes radiocarbon dating work-21what makes radiocarbon dating work-67what makes radiocarbon dating work-36

Because carbon-14 decays at this constant rate, an estimate of the date at which an organism died can be made by measuring the amount of its residual radiocarbon.

How do scientists determine the age of fossils that have been under the surface of the earth for thousands of years?

Scientific American Editor Michael Moyer explains the process of radiocarbon dating.

The method was developed by Willard Libby in the late 1940s and soon became a standard tool for archaeologists.

Libby received the Nobel Prize in Chemistry for his work in 1960.

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