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In contrast, from 1955 to 1963, atmospheric radiocarbon levels almost doubled.

Since then they have been dropping back toward natural levels.

Creationists often criticize radiocarbon dating in the context of discussions of the age of the earth.

In discussions of the age of the earth and the antiquity of the human race, creationists often assail perceived weaknesses in radiocarbon dating. Morris, for instance, wrote, "Despite its high popularity, [radiocarbon dating] involves a number of doubtful assumptions, some of which are sufficiently serious to make its results for all ages exceeding about 2000 or 3000 years, in serious need of revision." [Morris2000, pg. Radiocarbon dating is based on the fact that the interaction of cosmic rays from outer space with nitrogen atoms in the atmosphere produces an unstable isotope of carbon, namely radiocarbon.

The new method is based on the fact that over the past 60 years, environmental levels of radiocarbon have been significantly perturbed by mid-20th-century episodes of above-ground nuclear weapons testing.

Before the nuclear age, the amount of radiocarbon in the environment varied little in the span of a century.

Over the past six decades, the amount of radiocarbon in people or their remains depends heavily on when they were born or, more precisely, when their tissues were formed.

Forensic anthropologists at The University of Arizona took advantage of this fact in a recent study funded by NIJ.




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