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* Sample and sample pretreatment should be documented, if possible a picture should show the quality of the prepared sample.
** To establish the quality of the sample preparation outside our laboratory these samples should be accompanied by • at least two background samples • one or two standard samples (e.g. These samples have to be prepared in the same laboratory in substantially the same way as the unknown samples and will be charged as regular samples.
Direct AMS is committed to the value of research and the scientific conversation.
Our affordable prices are designed to allow all of our clients to measure more.
These prices include sampling (at Oxford), sample preparation, stable carbon isotope and AMS isotope measurement.
Please read our pages on sample weight requirements, and if you are unsure about the suitability of your sample please contact us.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.C dating service is for samples yielding at least 0.5 mg of carbon after chemical pretreatment (often acid-alkali-acid treatment of organic material).The precision of radiocarbon dates for recent samples (younger than 2000 years) is better than 0.4% which equals /-35 years for the 1-σ statistical uncertainty of the measured age.