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It cannot be applied to inorganic material such as stone tools or ceramic pottery. The technique is based on measuring the ratio of two isotopes of carbon. Carbon has an atomic number of 6, an atomic weight of The numbers 12, 13 and 14 refer to the total number of protons plus neutrons in the atom's nucleus. Thus carbon has six protons and eight neutrons. Carbon is by far the most abundant carbon isotope, and carbon and are both stable.
But carbon is slightly radioactive: The theory behind radiocarbon dating is as follows: Terrestrial carbon contains virtually no carbon, since any that may have been present would have long since decayed into the stable nitrogen Carbon dioxide in the atmosphere, however, contains a mixture of carbon and carbon in known proportions. Living plants absorb What is a weakness of the carbon dating method dioxide out of the air and incorporate it into their structure. The carbon atoms that make up, for example, a tree's annual growth ring, or the cob from an ear of corn, therefore contain the same isotope ratio as does the atmosphere. When the plant dies, the carbon starts to decay.
Measuring the ratio of the two isotopes therefore determines how long it has been since the constituent carbon atoms were absorbed from the atmosphere. The carbon in animals comes entirely from eating plants, or from eating other animals that eat plants. The technique can therefore be used to date human and animal remains. Why doesn't the carbon in the air decay along with terrestrial carbon? The trick is that radioactive carbon is continually replenished in a complex reaction that involves high-energy cosmic rays striking the upper atmosphere.