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Research has been ongoing since the 1960s to determine what the proportion of in the atmosphere has been over the past fifty thousand years.

The resulting data, in the form of a calibration curve, is now used to convert a given measurement of radiocarbon in a sample into an estimate of the sample's calendar age.

He calculated that it took 5,568 years for half of the 14C in dead organic matter to decay, known as the ‘half-life’.

By measuring the remaining 14C in a sample of excavated material, a calendar date could therefore be ascribed to it.

Alien plants are a pervasive environmental problem, particularly on islands where they can rapidly transform unique indigenous ecosystems.The older a sample is, the less (the period of time after which half of a given sample will have decayed) is about 5,730 years, the oldest dates that can be reliably measured by this process date to around 50,000 years ago, although special preparation methods occasionally permit accurate analysis of older samples.The idea behind radiocarbon dating is straightforward, but years of work were required to develop the technique to the point where accurate dates could be obtained.Libby, who had worked on cosmic radiation during the Second World War, discovered that living things absorb carbon present in the atmosphere.However, he also observed that one form of carbon, the isotope 14C, is unstable – it is radioactive – and that it decays at a fixed rate.

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