This represents the first published set of OCR dates on Australasian soil samples from archaeological site contexts.
The sequence of OCR dates has been paired with several [‘C dates as an initial trial of the technique under Australian conditions.
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Beyond that timespan, the amount of the original C formed by irradiation of nitrogen by neutrons from the spontaneous fission of uranium, present in trace quantities almost everywhere.
For these samples, other dating methods must be used.
Carbon dating has a certain margin of error, usually depending on the age and material of the sample used.
Carbon-14 has a half-life of about 5730 years, and therefore it is used to date biological samples up to about 60,000 years in the past.
You probably have seen or read news stories about fascinating ancient artifacts.