There are also various commands which can be used to help in the organisation of the plot. This might be useful for example in the case of single growth season material which will be expected to show some extra uncertainty (about 8 You can plot the default calibration curve by running an empty model.
To plot specific curves you can use the Curve() command for the relevant curves.
Radiocarbon dating is one of the most widely used scientific dating methods in archaeology and environmental science.
It can be applied to most organic materials and spans dates from a few hundred years ago right back to about 50,000 years ago - about when modern humans were first entering Europe.
The unit uses some thirty different pre-treatment methods for samples of different kinds and in different states of preservation.
There are separate graphs for the southern hemisphere and for calibration of marine data.
To produce a curve that can be used to relate calendar years to radiocarbon years, a sequence of securely dated samples is needed which can be tested to determine their radiocarbon age.
The study of tree rings led to the first such sequence: tree rings from individual pieces of wood show characteristic sequences of rings that vary in thickness because of environmental factors such as the amount of rainfall in a given year.
These factors affect all trees in an area, so examining tree-ring sequences from old wood allows the identification of overlapping sequences.