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    Radiocarbon dating bone samples

    The technique hinges on carbon-14, a radioactive isotope of the element that, unlike other more stable forms of carbon, decays away at a steady rate.

    Organisms capture a certain amount of carbon-14 from the atmosphere when they are alive.

    The bone at these sites consisted of isolated and restricted surface and subsurface scatters at the edge of the channel.

    The development of radiocarbon dating for degraded bone samples collected at Korean archaeological sites has been successful through the characterization of raw bone C/N ratios and application of an ultrafiltration method. We have examined a few dozen Korean archaeological bone samples for this study.We found that the C/N ratios of degraded raw bone samples can be used to determine whether C samples are acceptable for normal pretreatment processing and eventual dating. Our preliminary 14C dating results of a depth profile of Gunang-gul Cave, an archaeological site in Danyang, Korea, indicate that this site has been either geologically or anthropologically disturbed in the past, with 14C ages ranging from 28,910 ± 200 to 48,090 ± 1050 yr BP.The results of this study support that even if the C/N ratio of a degraded raw bone sample is 11, extraction of collagen for bone dating is feasible by a carefully designed ultrafiltration process. The C/N ratios of the collagen samples of Gunang-gul were determined to be 3.2-3.6. Climate records from a Japanese lake are set to improve the accuracy of the dating technique, which could help to shed light on archaeological mysteries such as why Neanderthals became extinct.Carbon dating is used to work out the age of organic material — in effect, any living thing.

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