Radiocarbon dating rocks

26-Jul-2017 11:34

Virtually all the nitrogen in the atmosphere is N-14 (only 0.36% is N-15).

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In other words, we have a ‘clock’ which starts ticking at the moment something dies.

Carbon-14 has a half-life of 5,730 ± 40 years— during the succeeding 5,730 years.