uncalibrated, radiocarbon ages are usually reported in radiocarbon years "Before Present" (BP), "Present" being defined as 1950.
Such raw ages can be calibrated to give calendar dates.
Scientists at the Lamont-Doherty Geological Laboratory of Columbia University at Palisades, N.
They arrived at this conclusion by comparing age estimates obtained geeks dating website two different methods - analysis of radioactive carbon in a sample and determination of the ratio of uranium datung thorium in the sample.
Sincescientists have reckoned the ages of many old objects by measuring the amounts of radioactive carbon they contain.
New research shows, however, that some estimates based on carbon may have erred by thousands of years.
Dating is not necessary to demonstrate that evolution is a fact.
There, you will find a brief description of the method, plus links to take you to other webpages with more extensive information.
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Libby estimated that the steady state radioactivity concentration of exchangeable carbon-14 would be about 14 disintegrations per minute (dpm) per gram.
In 1960, he was awarded the Nobel Prize in chemistry for this work.