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Plants and animals assimilate carbon 14 from carbon dioxide throughout their lifetimes.When they die, they stop exchanging carbon with the biosphere and their carbon 14 content then starts to decrease at a rate determined by the law of radioactive decay.Please note that to comment on an article you must be registered and logged in.Registration is for free, you may already be registered to receive, e.g., the newsletter.
Liquid scintillation counting is another radiocarbon dating technique that was popular in the 1960s.
It must be noted though that radiocarbon dating results indicate when the organism was alive but not when a material from that organism was used.
There are three principal techniques used to measure carbon 14 content of any given sample— gas proportional counting, liquid scintillation counting, and accelerator mass spectrometry.
Radiocarbon, or carbon 14, is an isotope of the element carbon that is unstable and weakly radioactive. Carbon 14 is continually being formed in the upper atmosphere by the effect of cosmic ray neutrons on nitrogen 14 atoms.
It is rapidly oxidized in air to form carbon dioxide and enters the global carbon cycle.