The radioactive carbon-14 combines with oxygen to form carbon dioxide and is incorporated into the cycle of living things. This neutron bombardment produces the radioactive isotope carbon-14. Carbon dating is a variety of radioactive dating which is applicable only to matter which was once living and presumed to be in equilibrium with the atmosphere, taking in carbon dioxide from the air for photosynthesis.Ĭosmic ray protons blast nuclei in the upper atmosphere, producing neutrons which in turn bombard nitrogen, the major constituent of the atmosphere.
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