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In contrast, methane made from petroleum products had no measurable radioactivity.

Pre-treatment seeks to remove from the sample any contaminating carbon that could yield an inaccurate date.

Libby, a Professor of Chemistry at the University of Chicago, predicted that a radioactive isotope of carbon, known as carbon-14, would be found to occur in nature.

During the lifetime of an organism, the amount of c14 in the tissues remains at an equilibrium since the loss (through radioactive decay) is balanced by the gain (through uptake via photosynthesis or consumption of organically fixed carbon).

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