Dating sites for 13 14

However, open-air nuclear testing between 1955–1980 contributed to this pool.

The different isotopes of carbon do not differ appreciably in their chemical properties.

This is small compared to the doses from potassium-40 (0.39 m Sv/year) and radon (variable).Libby estimated that the radioactivity of exchangeable carbon-14 would be about 14 disintegrations per minute (dpm) per gram of pure carbon, and this is still used as the activity of the modern radiocarbon standard.In 1960, Libby was awarded the Nobel Prize in chemistry for this work.Liquid scintillation counting is the preferred method.during his tenure as a professor at the University of Chicago.

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