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We can equally well use a different standard if we know its relation to "modern," or 1950 AD.Radiocarbon ages are then quoted as "years before present" (BP).C produced in the atmosphere were always the same, then we could calculate a "radiocarbon age" using the equation we have discussed directly as an estimate of sample age. This was recognized soon after Libby published his first Curve of Knowns (Arnold and Libby, 1949).The cosmic rays striking the upper atmosphere fluctuate in intensity with time by a small amount due to changes in the magnetic fields of the sun and the earth.This creates an error in the "raw" age of about 2 percent.Since nearly all applications where the precise age is needed require calibration, this difference is removed in the calibration process].

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It was recognized that direct measurement of the number of C atoms in the sample would greatly enhance the sensitivity, and several unsuccessful attempts were made in this direction using conventional mass spectrometry.

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).

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.

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