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These are the basis for the calibrations performed by the programs like CALIB and Ox Cal. Calibration of radiocarbon determinations is in principle very simple.If you have a radiocarbon measurement on a sample, you can try to find a tree ring with the same proportion of radiocarbon.
between 2940BP and 3060BP for the measurement 3000 -30BP).
A slightly different method is now more often used which is called the `probability method'.
This requires a computer since the calculations are more complicated.
It gives the time range, from which you can be 95% sure the sample came.
Once calibrated a radiocarbon date should be expressed in terms of cal BC, cal AD or cal BP.
The cal prefix indicates that the dates are the result of radiocarbon calibration using tree ring data.
Since the calendar age of the tree rings is known, this then tells you the age of your sample.
In practice this is complicated by two factors: These effects are most clearly seen by looking at a specific example.
The pair of blue curves show the radiocarbon measurements on the tree rings (plus and minus one standard deviation) and the red curve on the left indicates the radiocarbon concentration in the sample.
The grey histogram shows possible ages for the sample (the higher the histogram the more likely that age is).
The first indicates the proportion of radiocarbon atoms in the sample as compared to samples modern in 1950.Tags: Adult Dating, affair dating, sex dating