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The results from AMS testing are in the form of ratios of 12 C13 Cand 14 Cwhich are used to calculate Fm, the ""fraction modern"". Both beta counting and AMS results have to be corrected for fractionation. The calculation uses Libby's half-life of 5, years, not the more accurate modern value of 5, years. The reliability of the results can be improved by lengthening the testing time. Radiocarbon dating is generally limited to dating samples no more than 50, years old, as samples older than that have insufficient 14 C to be measurable.
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