Define radio carbon dating

Radiocarbon years ago may be abbreviated " The Northern hemisphere curve from INTCAL13.

As of 2017 this is the most recent version of the standard calibration curve.

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The graph to the right shows the part of the INTCAL13 calibration curve from 1000 BP to 1400 BP, a range in which there are significant departures from a linear relationship between radiocarbon age and calendar age.

In places where the calibration curve is steep, and does not change direction, as in example t in blue on the graph to the right, the resulting calendar year range is quite narrow.

ratio might have varied over time, it was not until discrepancies began to accumulate between measured ages and known historical dates for artefacts that it became clear that a correction would need to be applied to radiocarbon ages to obtain calendar dates.

A general abbreviation, ambiguous if not understood from context, used for reporting dates obtained with any method is Before Present (BP), where "present" is 1950.

The improvements to these curves are based on new data gathered from tree rings, varves, coral, and other studies.

Significant additions to the datasets used for INTCAL13 include non-varved marine foraminifera data, and U-Th dated speleothems.

Where the curve varies significantly both up and down, a single radiocarbon date range may produce two or more separate calendar year ranges.

Example t, in red on the graph, shows this situation: a radiocarbon age range of about 1260 BP to 1280 BP converts to three separate ranges between about 1190 BP and 1260 BP.

In this way, an uninterrupted sequence of tree rings can be extended far into the past.

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