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Benefits of using radiocarbon dating

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AMS, on the other hand, can in principle detect a much higher proportion (typically about 1% of the total) allowing sample sizes to be smaller by a factor of about a thousand.The method is relatively new because it needs very complicated instruments first developed for Nuclear Physics research in the late 20th century.Radiometric dating is also used to date archaeological materials, including ancient artifacts.Different methods of radiometric dating vary in the timescale over which they are accurate and the materials to which they can be applied.When an organism, eg a tree, dies it stops taking in carbon dioxide.The amount of carbon-14 in the wood decreases with time as it decays into nitrogen with a half-life of about 5700 years.In common with other kinds of mass spectrometry, AMS is performed by converting the atoms in the sample into a beam of fast moving ions (charged atoms).The mass of these ions is then measured by the application of magnetic and electric fields.

Together with stratigraphic principles, radiometric dating methods are used in geochronology to establish the geological time scale.The measurement of radiocarbon by mass spectrometry is very difficult because its concentration is less than one atom in 1,000,000,000,000.The accelerator is used to help remove ions that might be confused with radiocarbon before the final detection.Isotopes of a particular element have the same number of protons in their nucleus, but different numbers of neutrons.This means that although they are very similar chemically, they have different masses.The amount of carbon-14 in the atmosphere has not changed in thousands of years.