Graphitisation for radiocarbon dating

Graphitisation for radiocarbon dating

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Credit: JAMES KING-HOLMES/SCIENCE PHOTO LIBRARY

Caption: Using a flask of liquid nitrogen to freeze carbon dioxide gas in a glass ampoule as a stage in the radiocarbon dating of carboniferous samples. The carbon dioxide will be converted to graphite, used to determine the level of the carbon-14 isotope by an accelerator mass spectrometer. Evaluation of this figure and comparison with the proportion of carbon-12 present leads to a value indicating an age of the original sample. Photographed at the Oxford Radiocarbon Accelerator Unit, University of Oxford, UK

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Keywords: accelerator mass spectrometry, ams, analyser, analyzer, archaeology, archeology, c12: isotope, c14, carbon, carbon dating, carbon-12, carbon-14, cryogenic, date, dating, elemental, freeze, freezing, graphite, graphitisation, liquid nitrogen, mass spectrometer, nitrogen, radio-isotope, radiocarbon

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