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Mixing and exchanges happen between the atmosphere and the biosphere until such time that equilibrium is established.
Radiocarbon dating rests heavily on this assumption such that other sources of carbon 14 had, at first, not been considered nor accounted for.
Even after nuclear weapon testing was banned, the bomb effect still remains.
According to literature, the excess carbon 14 produced during nuclear weapons testing has already decreased due in part to the global carbon exchange cycle.
The level of bomb carbon was about 100% above normal levels between 19.
There are also other studies that monitored the presence of bomb carbon or radiocarbon in general.
By the 1990s, the carbon 14 level was only about 20% higher than the theoretical 1950 level as measured by the activity of the oxalic acid reference standard.
Bomb carbon is essentially an artificial injection of carbon 14.
The radiocarbon dating method is based on certain assumptions on the global concentration of carbon 14 at any given time.
One assumption is that the global levels of carbon 14 (also called radiocarbon) in the atmosphere has not changed over time.The other assumption is the corollary of the first; the biosphere has the same overall concentration of radiocarbon as the atmosphere due to equilibrium.