These prices include sampling, chemical pre-treatment, stable carbon isotope and AMS isotope measurement for samples relevant to research in Archaeology or Environmental Science.We will also give advice on the choice of samples for dating and help in the calibration and analysis of dates in context.
Charcoal and wood are two of the most widely used materials for accelerator mass spectrometry (AMS) radiocarbon dating.
AMS labs prefer to carbon date charcoal and wood because these materials do not need complex pretreatment.
The radiocarbon lab at Geochron uses gas proportional counters to measure methane derived from relatively small samples.
We also offer liquid scintillation analysis using an extra low background Quantulus 1220 for high precision measurements on benzene.
Radiocarbon dating is the principal method for determining the age of carbon-bearing materials from the present to about 50,000 years ago.
The method takes advantage of the natural occurrence of a radioactive isotope of carbon (C in samples of ancient carbon compounds and comparing this with the amount in modern materials, it is possible to determine the time of cessation of carbon exchange with the atmosphere.
Willard Libby, the pioneer of radiocarbon dating, identified charcoal to be the most reliable material to carbon date.
The time-width of an organism refers to its total growth and exchange period with the biosphere.
Trees grow by the addition of rings, and these rings stop exchanging carbon with the biosphere once they are laid down.