Radiocarbon dating nuclear testing
It is relatively easy to achieve 0.5-0.8% precision when analyzing recent full-sized samples.
As the slope of the pulse flattens, the uncertainty in C analysis translates into a larger chronological uncertainty.
To determine year of birth, the researchers focused on tooth enamel.
Adult teeth are formed at known intervals during childhood.
C has not actually disappeared, it has simply moved out of the atmosphere.
The temporal variations of artificially high levels of atmospheric radiocarbon have been captured in organic material world-wide and thus offer an opportunity to determine a date of synthesis for biomolecules.
The new method is based on the fact that over the past 60 years, environmental levels of radiocarbon have been significantly perturbed by mid-20th-century episodes of above-ground nuclear weapons testing.
However, it has been confirmed that atmospheric C concentration with the date.
When the slope was steep, the uncertainty was typically ± 1 year.
Since 2000, that same measurement precision yields a chronological uncertainty of ± 2-4 years.
Using an annual average of the carbon intake over a growing season can account for much food chain lag and produce a usable curve (Figure 1).
Caution must be exercised when dating an elevated sample since the pulse is double valued.