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Related to radiocarbon dating: Potassium argon dating
a technique for determining the age of organic materials, such as wood, based on their content of the radioisotope 14C acquired from the atmosphere when they formed part of a living plant. The 14C decays to the nitrogen isotope 14N with a half-life of 5730 years. Measurement of the amount of radioactive carbon remaining in the material thus gives an estimate of its age
radiocarbon dating[¦rad·ē·ō′kär·bən ′dād·iŋ]