They synthesized Libby and several collaborators proceeded to experiment with methane collected from sewage works in Baltimore, and after isotopically enriching their samples they were able to demonstrate that they contained radioactive .
By contrast, methane created from petroleum showed no radiocarbon activity because of its age.
The results were summarized in a paper in Science in 1947, in which the authors commented that their results implied it would be possible to date materials containing carbon of organic origin.
Libby and James Arnold proceeded to test the radiocarbon dating theory by analyzing samples with known ages.
A correction for the half-life is incorporated into calibration curves, so even though radiocarbon ages are calculated using a half-life value that is known to be incorrect, the final reported calibrated date, in calendar years, is accurate.
A large number of pottery utensils and stone tools have been discovered in the same pit, as well as an urn decorated with a leaf design and a cone-shaped tripod with pierced decoration.
(Xinhua/Feng Dapeng) ZHENGZHOU, July 12 (Xinhua) -- Carbon dating has recently confirmed the age of a 3,800-year-old red pottery bird statue, unearthed in central China's Henan Province.
The item was found at the ruins of the city of Xinzhai, discovered in 1979 and believed to be founded by Qi, king during the Xia Dynasty, as early as 2050 BC.
A staff member of Chinese Academy of Social Sciences shows a pottery bird statue in Xinmi, central China's Henan Province, July 10, 2017.
Carbon dating has recently confirmed the age of the 3,800-year-old red pottery bird statue, unearthed at the ruins of the city of Xinzhai in Henan Province.