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The most well-known of all the radiometric dating methods is radiocarbon dating.
They showed that methane collected from the Baltimore sewage works had measurable radiocarbon activity, whereas methane manufactured from petroleum did not, and the implications of the findings for dating of carbonaceous materials were noted.
These first experiments required enrichment of the radiocarbon in the sample to make it easily detectable.
Yet, as simple and straightforward as this seems, the process of dating objects via radiocarbon is far from simple and straightforward.
Here I will present what radiocarbon is, the dating methods, the assumptions that govern them, and the known discrepancies that plague the method.
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If you feel that you already know this technique in sufficient detail to understand why Libby needs a global constant C14 concentration, feel free to skip ahead ...)"The existence of radiocarbon in nature was predicted before it was detected.In 1946 he published a paper suggesting that radiocarbon might exist in living matter.One year later, a single-page paper appeared in the journal Science in which Ernest Anderson and Libby, together with collaborators in Pennsylvania, summarised the first detection of radiocarbon in material of biological origin.After radiocarbon forms, the nuclei of the carbon-14 atoms are unstable, so over time they progressively decay back to nuclei of stable nitrogen-14.3 A neutron breaks down to a proton and an electron, and the electron is ejected. The ejected electrons are called beta particles and make up what is called beta radiation. Different carbon-14 atoms revert to nitrogen-14 at different times, which explains why radioactive decay is considered a random process.Radiocarbon Dating inaugurates a new series, "Interpreting the Past," published jointly by the British Museum and the University of California Press.