Start Calibration curve for the radiocarbon dating scale

Calibration curve for the radiocarbon dating scale

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.

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.

For older periods we are able to use other records of with idependent age control to tell us about how radiocarbon changed in the past.

For this purpose `present' refers to 1950 so you do not have to know the year in which the measurement was made.

See also ORAU's Explanation of Radiocarbon Results.

Radiocarbon dates should always be reported either as `percent modern' or years `before present' (BP).

between 2940BP and 3060BP for the measurement 3000 -30BP).