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The difference of the two curves (R) is ~400 yr on average.
This more liberal approach to interpreting radiocarbon ages applies only to one single radiocarbon age measured.
If multiple analyses are performed, statistically similar but different ages could produce different likelihoods.
Four zonal data sets of tropospheric bomb C ages is usually undertaken using a computer program. Examples of radiocarbon calibration for the traditional radiocarbon dating and the bomb-pulse dating are shown in Figs.
Several calibration programs are available on-line.
During this time the C level intermediate between these two reservoirs.
Marine samples living in the surface ocean (e.g., shells, corals and planktonic foraminifera), therefore appear older than contemporaneous terrestrial samples.
These variations are due to changes in ocean circulation and the carbon cycles associated with climatic change.
Temporal variations in C was artificially produced when hundreds of nuclear test weapons were detonated in the atmosphere, mostly in the Northern Hemisphere, in the late 1950s and early 1960s.
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