Carbon dating

Numéro d’image : 11826033
Carbon dating
Carbon dating. Sample being removed from bone for carbon dating using accelerator mass spectrometry (AMS). The bone is a human femur that is thought to be medieval. All living material incorporates a radioactive isotope of carbon,carbon-14 (14C),and a stable isotope,carbon-12 (12C),into its tissue at a known ratio. When the tissue dies the amount of 12C remains constant,but 14C decays. Measuring the amount of 14C compared to 12C in a sample indicates how long ago the tissue died. Carbon dating using AMS requires only a very small sample of material,minimising the damage to a specimen. Gloves are worn to prevent contamination of the sample. Photographed at Oxford Radiocarbon Accelerator Unit,University of Oxford,UK
Licence : Droits gérés
Crédit: Science Photo Library / King-Holmes, James
Taille de l’image : 5080 px × 3413 px
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