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Libby, a Professor of Chemistry at the University of Chicago, predicted that a radioactive isotope of carbon, known as carbon-14, would be found to occur in nature.

Working with several collaboraters, Libby established the natural occurrence of radiocarbon by detecting its radioactivity in methane from the Baltimore sewer.

Normal handling will not contaminate most sample types, however, samples should be protected from sources of extraneous carbon.

Charcoal and wood samples should be wrapped in aluminum foil or heavy plastic and should not be wrapped in paper.

Above Left: Wallack 1220 Quantulus™ Ultra Low Level Liquid Scintillation spectrometer.

Above Right: Packard 2000CA/LL TRI-CARB® Liquid Scintillation Analyzer.

In contrast, methane made from petroleum products had no measurable radioactivity.

This discovery meant that there are three naturally occurring isotopes of carbon: Whereas carbon-12 and carbon-13 are stable isotopes, carbon-14 is unstable or radioactive.

Materials suitable for radiocarbon dating include charcoal, wood and other plant matter, soils and sediments, shells, bone, carbonates, dissolved inorganic carbonate (DIC), methane and hydrocarbons, and food products.A table of optimum and minimum sample sizes is provided below.Please feel free to contact our lab staff to discuss the specific details of your samples.A mass spectrometer is an instrument that uses a series of magnets to bend a beam of ions and then physically count how many there are, so with AMS radiocarbon dating, we can measure a carbon-12, 13 and 14 beam, and we measure the ratio of 14 to 13, and from that, we can tell how much C-14 is in the sample.So the most important things about AMS radiocarbon dating as opposed to conventional is that the sample size is much, much smaller.




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