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date of organic material - but an approximate age, usually within a range of a few years either way.
There are a number of ways to enter into a career in studying radiocarbon dating.The next big step in the radiocarbon dating method would be Accelerated Mass Spectrometry which was developed in the late 1980s and published its first results in 1994 (3).This was a giant leap forward in that it offered far more accurate dates for a far smaller sample (9); this made destruction of samples a far less delicate issue to researchers, especially on artefacts such as The Shroud of Turin for which accurate dates were now possible without damaging a significant part of the artefact.When the half-life was corrected in 1950, the year was taken as a base date from which to calculate all resulting dates.
Therefore, any expression of “before present” will mean “before 1950”.
This allows researchers to account for variation by comparing the known records of C levels in the tree record, looking for a tree record that has the same proportion of radiocarbon.