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A fluorescence event is proportional to the decay event of C14; and the frequency is proportional to the number of C14 atoms in the sample.

Instead of measuring the radioactivity of the sample (as in LCS); Accelerator Mass Spectrometry (AMS) counts directly the radiocarbon atoms.

The sample is converted into a beam of ions whose mass is measured by the addition of magnetic and electric fields.

Because the concentration of C14 is so minute, it is difficult to use conventional mass spectrometry.

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