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Two other reactions (Oxygen-17 reacting with neutrons, and He-4 reacting with Carbon-13) both produce Carbon-14, but with much smaller yields.
It has been estimated that about 21 pounds of The amount of nitrogen in the atmosphere is effectively constant.
Three of the Carbon isotopes (C) are found in nature.
The rest of the carbon isotopes are only of laboratory interest.
Thus the breakdown of radioactive atoms is a self-corrective process; those Isotopes which have too many neutrons loose a neutron in the beta decay, and those Isotopes which have too few neutrons gain a neutron in the positron decay.