Definition of "carbon-14" [carbon-14]

• A radioactive isotopes of carbon, 146C, having six protons and eight neutrons; it is used in radiocarbon dating (noun)

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• "However, about one atom in a trillion is carbon-14, which is radioactive."
• "All living creatures, whether plants or animals, have approximately the same ratio of carbon-12 to carbon-14, which is the same ratio as you’ll find in the atmosphere."
• "In addition, minute fragments of bone were sent for carbon-14 testing by experts unaware of their provenance."