Bomb radiocarbon dating
Our bodies are prolific artists, creating new cells throughout the body.Some cells, like those found in skin, hair, and the lining of the gut, are produced and discarded on a regular basis, like doodles on scrap paper. Kirsty Spalding was one of the scientists who doubted that assessment.However, the accuracy of this estimated age has not yet been confirmed.In this study, the estimated ages of PBF were validated by a novel use of post-bomb radiocarbon dating.The bomb pulse has been declining since the 1963 above-ground test ban treaty, creating a sort of clock they could exploit.
The reason for this anomaly is that the limestone, which is weathered and dissolved into bicarbonate, has no radioactive carbon.
The analysis was based on a metric of the abundance of C of the otolith core portions of fish estimated to be 2–27-years of age gradually declined as birth year approached the present day.
This trend was consistent with the trend of the reference values and 10‰ lower.
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.
But without knowing exactly when each neuron was created, scientists couldn’t say with any certainty that this was true.