Calculate age using radiocarbon dating
Fluctuations in the amount of carbon dioxide in the atmosphere can also affect the concentration of . 2, which shows the increasingly large difference between radiocarbon and true age from 7000 to 15000 years BP.
This deviation is much smaller less than 7000 years ago.
However, this inconsistency is corrected during calibration [the reason for using the (Willard F.) Libby half-life of 5568 years instead of the correct one of 5730 years has to do with the finding in about 1962 that the true half-life was 573030 years.
Accurate dating also had to wait for a good calibration of the radiocarbon time-scale in the 1960s, using an absolute chronology based on tree rings.
The radiocarbon time-scale has now been calibrated with tree rings to more than 10000 years before present, and beyond that using a coral chronology (Stuiver, et al., 1993).
About one carbon nucleus in a trillion contains two extra neutrons, giving a mass of 14.
This carbon-14 is radioactive and decays with a half-life of 5730 years.