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Radiocarbon, or carbon 14, is an isotope of the element carbon that is unstable and weakly radioactive. Carbon 14 is continually being formed in the upper atmosphere by the effect of cosmic ray neutrons on nitrogen 14 atoms.

These standard calibration curves assume that at any given time radiocarbon levels are similar and stable everywhere across each hemisphere. "We went looking to test the assumption behind the whole field of radiocarbon dating," Manning said.

Radiocarbon dating is essentially a method designed to measure residual radioactivity.

By knowing how much carbon 14 is left in a sample, the age of the organism when it died can be known.

It must be noted though that radiocarbon dating results indicate when the organism was alive but not when a material from that organism was used.

There are three principal techniques used to measure carbon 14 content of any given sample— gas proportional counting, liquid scintillation counting, and accelerator mass spectrometry.A la rentrée prochaine pour de nouvelles aventures et de nouveaux voyages à travers l’espace et à travers le temps… But new research shows that commonly accepted radiocarbon dating standards can miss the mark -- calling into question historical timelines.Small samples were removed from the wood foreshaft on three specimens and the wrapping material on one and submitted to Beta Analytic Inc. Two samples received the standard pretreatment and analysis and two received a solvent extraction to remove any potential preservative/pesticide contamination. For those samples not large enough for 13C/12C ratio measurement, a ratio including both natural and laboratory effects was measured during the 14C detection to derive a conventional radiocarbon age suitable for applicable calendar calibration.