Calibration and radiocarbon dating
These likelihoods are graphically represented by a shaded grey area on the plot higher peaks being higher probability and by percentage values reported next to each range. Tree rings provided truly known-age material needed to check the accuracy of the carbon dating method. At present, tree rings are still used to calibrate radiocarbon determinations. In later years, the use of accelerator mass spectrometers and the introduction of high-precision carbon dating have also generated calibration curves. Human remains discovered during excavations of cemetery from early Iron Age in Kosiorow village, Eastern Poland.
Tree rings are used to calibrate radiocarbon measurements. The confidence level corresponding to calibrated ranges must also be included. These standard calibration curves assume that at any given time radiocarbon levels are similar and stable everywhere across each hemisphere. Carbon is a naturally occurring isotope of the element carbon. If a sample has the same proportion of radiocarbon as that of the tree ring, it is safe to conclude that they are of the same age.
Results of carbon dating are reported in radiocarbon years, and calibration is needed to convert radiocarbon years into calendar years. Despite this, the approach is considered legitimate and is accepted in peer-reviewed journals.
Wiggle-matching can be used in places where there is a plateau on the calibration curve, and hence can provide a much more accurate date than the intercept or probability methods are able to produce. This method is the most conservative indication of calendar age. And indeed, results of calibration are often given as an age range rather than an absolute value.
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