Carbon-14 has six protons and eight neutrons. Atmospheric production is dominated by using secondary cosmic ray neutrons. It undergoes beta-minus decay to nitrogen-14, with a physical half-life of approximately years.
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Carbon-14 (C-14) is a radioactive isotope of carbon. It is formed in the upper atmosphere when cosmic rays interact with nitrogen-14 (N-14) in a process known as cosmic ray spallation. Carbon-14 has a half-life of about 5,730 years, which means that it takes this amount of time for half of a given sample of C-14 to decay into nitrogen-14 through beta decay.
