It is also worth noting that the half-life used in carbon dating calculations is 5568 years, the value worked out by chemist Willard Libby, and not the more accurate value of 5730 years, which is known as the Cambridge half-life.
Although it is less accurate, the Libby half-life was retained to avoid inconsistencies or errors when comparing carbon-14 test results that were produced before and after the Cambridge half-life was derived.
Radiocarbon dating laboratories have been known to use data from other species of trees.
Dendrochronological findings played an important role in the early days of radiocarbon dating.The tree rings were dated through dendrochronology.At present, tree rings are still used to calibrate radiocarbon determinations.The first calibration curve for radiocarbon dating was based on a continuous tree-ring sequence stretching back to 8,000 years.
This tree-ring sequence, established by Wesley Ferguson in the 1960s, aided Hans Suess to publish the first useful calibration curve.Calibration is not only done before an analysis but also on analytical results as in the case of radiocarbon dating—an analytical method that identifies the age of a material that once formed part of the biosphere by determining its carbon-14 content and tracing its age by its radioactive decay.