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Forensic experts use radiocarbon dating to establish if an individual died recently (perhaps a matter for the Justice Department) or in antiquity (a matter for the archaeologist). Living things assimilate radiocarbon from the atmosphere.
Other cells, like those in the adult brain and nervous system, have been viewed as more like the Mona Lisa. Spalding, once a postdoc at the Karolinska Institute in Stockholm, Sweden and now a professor there, knew there were tantalizing hints that the adult hippocampus—a seahorse-shaped region deep in the brain that is important for memory and learning—could regenerate neurons.The proliferation of atmospheric thermo-nuclear testing in the early 1950s until 1963 added vast amount of artificial radiocarbon (bomb carbon) in the atmosphere, increasing global radiocarbon levels by almost 100% compared to the pre-1950 level.