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The isotopic distribution of potassium on the Earth is approximately 93% Ar nuclei that appeared as a result of radioactive decay would be trapped by the crystal structure and accumulate as the mineral aged.
In a hypothetical mineral sample with an initial population of 64 Potassium-Argon dating techniques have been used to date minerals covering the entire span of geologic history from 10 thousand to 3 billion years old.
Bacteria, fungi, and animals eat these plants and each other.
In this way, atmospheric carbon is distributed throughout the web of life until every living thing has the same ratio of C as the atmosphere. Plants and animals tend to favor lighter nuclei just a bit.
A secondary cosmic ray neutron of sufficient energy striking a common nitrogen 14 nucleus can force it to eject a proton.