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These values have been derived through statistical means.American physical chemist Willard Libby led a team of scientists in the post World War II era to develop a method that measures radiocarbon activity.Background samples analyzed are usually geological in origin of infinite age such as coal, lignite, and limestone.A radiocarbon measurement is termed a conventional radiocarbon age (CRA).

It is rapidly oxidized in air to form carbon dioxide and enters the global carbon cycle.A vial with a sample is passed between two photomultipliers, and only when both devices register the flash of light that a count is made.Accelerator mass spectrometry (AMS) is a modern radiocarbon dating method that is considered to be the more efficient way to measure radiocarbon content of a sample.Archaeology and other human sciences use radiocarbon dating to prove or disprove theories.Over the years, carbon 14 dating has also found applications in geology, hydrology, geophysics, atmospheric science, oceanography, paleoclimatology and even biomedicine.

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