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Despite this she continually uses the c14 dates to create 'absolute' chronologies.She says this is ok so long as you take into account the correction factors from dendrochronology.Dates up to this point in history are well documented for C14 calibration.
Example: wood found in a grave of known age by historically reliable documents is the standard for that time for the C14 content.
This standard content of C14 can then be used for wood not associated with a historically documented date.
And this big sequence is then used to 'correct' C14 dates. (3.) Even if the rate of decay is constant, without a knowledge of the exact ratio of C12 to C14 in the initial sample, the dating technique is still subject to question.
(4.) Traditional 14C testing assumes equilibrium in the rate of formation and the rate of decay.
Libby, the discoverer of the C14 dating method, was very disappointed with this problem.