The decay events for each sample are measured over a week. Proceedings of the Royal Society of London B: There are several other possible sources of error that need to be considered. The level has since dropped, as this bomb pulse or "bomb carbon" as it is sometimes called percolates into the rest of the reservoir. Histories of archaeology often refer to its impact as the "radiocarbon revolution".
Date of sample determined The moa bone analysis gave a radiocarbon date of plus or minus 40 years.
Molecular clock. In the s samples were tested with AMS, yielding uncalibrated dates ranging from 11, BP to 11, BP, both with a standard error of years. In nature, carbon exists as two stable, nonradioactive isotopes: