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C-14 decays to nitrogen-14 with a half life of 5730 40 years. After 75,000 years (13 half-lives), almost all of the C-14 would be gone. C-14 is therefore not used for fossils thought to be over 75,000 years old. Click here for more information.

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Ó 2010 Arthur V. Chadwick, Ph.D.