Radiocarbon dating machine calibration dating in sligo

Posted by / 25-Feb-2015 08:12

The bone sample was highly encrusted and in-filled with non-calcareous minerals.

These minerals were physically eliminated with grinding, prior to demineralization of the apatite fraction with hydrochloric acid.

Please find enclosed the radiocarbon dating result for one bone sample "CENWW.97.

It was very small, requiring us to convert the sample carbon to graphite and then to count the radiocarbon atomically using an accelerator mass spectrometer (AMS).

It provided plenty of carbon for reliable measurements and all analytical steps went normally. Since these errors cannot include uncertainties outside of those which can be quantified during measurement, it is best to consider them as minimum quotes.

The report sheet contains calibration results which enhance the accuracy of the radiocarbon dating.

A hard-copy is enclosed showing the radiocarbon year/calendar year correlation curve segment associated with the radiocarbon date, along with explanation sheets.

You will notice the X axis (cal BC age) that multiple two sigma ranges are possible for the radiocarbon date. The results are reported in three formats; the Conventional Radiocarbon Age (BP) which is systematic with radiocarbon dates quoted without calendar calibration, calibrated calendar age (cal BC) which is corrected for true half life and atmospheric fluctuations and reported in calendar years, and calibrated Conventional Radiocarbon Age (cal BP), where the same half life and atmospheric fluctuation corrections are applied to provide a corrected BP format result (BP = before present, present being AD 1950).

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The cal BC and cal BP results are reported using the two sigma, 95% probability limitation.