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Fractionation radiocarbon dating

The amu is defined by the mass of a neutral 12C atom, which weighs exactly 12 amu.

On this scale the proton has a mass of 1.0073 amu and the neutron a mass of 1.0087 amu. Atomic Number: The number of protons in an atomic nucleus.

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The impact of cosmic rays on the atmosphere gives rise to nuclear reactions, generating the cosmogenic nuclides such as 14C, 10Be and 26Al.

Cosmogenic Nuclides: Rare isotopes that are generated mainly, or entirely, by the effects of cosmic rays on the earth's atmosphere or the first few metres of its surface. Compact Accelerator Mass Spectrometry (CAMS): The same technique that is used by AMS but designed for use in limited space.

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Since the oxalic acid standard used in 14C measurements is itself decaying, in order to represent the absolute 14C activity in a material, as distinct from the ratio of the activity to the standard, the decay of the standard must be taken into account.‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.Find out more about the Kindle Personal Document Service. If your browser does not accept cookies, you cannot view this site.There are many reasons why a cookie could not be set correctly.

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