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Unlike long-term radiometric dating methods, radiocarbon relies on knowing the fraction of radioactive carbon-14 in the atmosphere at the time the object being dated was alive. The production of carbon-14 by cosmic rays was up to a factor of about two higher than at present in the timescales over which radiocarbon can be used. Data for the last 11,800 years comes from tree-ring counting, while the data beyond that age comes from other sources, such as from a carbonate stalagmite for the data shown here. The bottom panel shows the offset in
uncalibrated ages caused by this change in atmospheric composition. Tree-ring data are from Stuiver et al.,
Radiocarbon 40, 1041-1083, 1998; stalactite data are from Beck et al., Science 292, 2453-2458, 2001.
Uncalibrated radiocarbon ages underestimate the actual ages.
Get out there to the people and tell them the truth of this flawed dating method. People do need the truth, and they need to stop trying to force feed false methods!