Calculate age using carbon dating

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The activity ratio relates to the carbon 14 activity ratio between the ancient samples and the modern activity. Eventually the reaction would reach some equilibrium and the amountof Carbon-14 in the atmosphere would remain constant. This provides a value for the background radiation, which must be subtracted from the measured activity of the sample being dated to get the activity attributable solely to that sample's 14 C.

But these could not last more than a few thousand years—certainly not the 65 Ma since the last lived, according to evolutionists. Berkeley, California: University of California Press. Libby and his team intially tested the radiocarbon method on samples from prehistoric Egypt.

Lesson 15: Half-life part 2 - Since Nitrogen gas makes up about 78 percent of the Earth's air, by volume, a considerable amount of Carbon-14 is produced. The radioactivity halves with each half-life.