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Other methods do not require knowing the initial quantities.For example, potassium decays into two different isotopes of argon having different half-lives.There are about two dozen decay pairs used for dating.
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When the carbon dioxide, containing C14 as well as stable C12 and C13, is taken in by plants it is no longer exposed to the intense cosmic ray bombardment in the upper atmosphere, so the carbon 14 isotope decays without being replenished.
Radiometric dating is the method for establishing the age of objects by measuring the levels of radioisotopes in the sample. It decays to nitrogen 14 with a half life of 5730 years.
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