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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.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.Please feel free to contact our lab staff to discuss the specific details of your samples.Normal handling will not contaminate most sample types, however, samples should be protected from sources of extraneous carbon.Very small samples (less than 300 mg) are analyzed by accelerator mass spectrometry (AMS).We have subcontractor agreements with several AMS facilities around the world.
CEN has the equipment and expertise to prepare samples for AMS dating, which includes 2 major steps: C of your samples can also be done.
We are using the AMS method (Accelerator Mass Spectrometry). C-H-N analyses are also available now (possibility to get the percentages of C (Carbon), H (Hydrogen) and N (Nitrogen) for dry samples.
The analyses are processed with a Leco CHN628 elemental analyzer.
With every shipment of many unknown-age samples we must add samples coming from oxalic acid transformation (which is the international standard reference material for all radiocarbon laboratories), inert samples to determine the background value (blanks) as well as known-age samples (secondary standards), coming from multi-laboratory calibration.
This procedure assures a never-ending following of the quality, accuracy and precision of the results given to customers.
This section covers the submission of standard sample types.