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Thus it is possible in some instances for two samples from a few decades apart to have the same radiocarbon concentration today, and hence the same apparent radiocarbon age.

Because the radiocarbon to stable carbon ratio in the atmosphere has fluctuated over time, there are "wiggles" in the calibration curve.

Once the radiocarbon concentration in a sample has been measured, the sample's age in "radiocarbon years" is determined mathematically.

The radiocarbon age must then be calibrated to determine the sample's age in calendar years.

A common misconception about radiocarbon dating is that it gives a precise date---3577 B. In actual practice radiocarbon dating can only give a range of dates for a given sample---3650 to 3410 B.

C., for example---the true date lying somewhere in that range.

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