Errors carbon 14 dating
It was unclear for some time whether the wiggles were real or not, but they are now well-established.
These were superseded by the INTCAL series of curves, beginning with INTCAL98, published in 1998, and updated in 2004, 2009, and, most recently, 2013.
Programs to perform these calculations include Ox Cal and CALIB.
These can be accessed online; they allow the user to enter a date range at one standard deviation confidence for the radiocarbon ages, select a calibration curve, and produce probabilistic output both as tabular data and in graphical form.
Discrepancies began to be noted between measured ages and known historical dates for artefacts, and it became clear that a correction would need to be applied to radiocarbon ages to obtain calendar dates. As of 2017 this is the most recent version of the standard calibration curve.This output can be compared with the output of the intercept method in the graph above for the same radiocarbon date range.For a set of samples with a known sequence and separation in time such as a sequence of tree rings, the samples' radiocarbon ages form a small subset of the calibration curve.In the example CALIB output shown at left, the input data is 1270 BP, with a standard deviation of 10 radiocarbon years.The curve selected is the northern hemisphere INTCAL13 curve, part of which is shown in the output; the vertical width of the curve corresponds to the width of the standard error in the calibration curve at that point.