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To determine year of birth, the researchers focused on tooth enamel.Adult teeth are formed at known intervals during childhood. The Radiocarbon Revolution Since its development by Willard Libby in the 1940s, radiocarbon (14C) dating has become one of the most essential tools in archaeology.
Therefore, the radiocarbon level in those tissues post-mortem would indicate the year of death.
In contrast, from 1955 to 1963, atmospheric radiocarbon levels almost doubled.
Since then they have been dropping back toward natural levels.
However, more testing is needed to confirm that belief. 269, March 2012NCJ 237722 Philip Bulman is a writer and editor at NIJ.
Danielle Mc Leod-Henning is a program manager and physical scientist at NIJ.