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He is credited to be the first scientist to suggest that the unstable carbon isotope called radiocarbon or carbon 14 might exist in living matter. Libby and his team of scientists were able to publish a paper summarizing the first detection of radiocarbon in an organic sample. Libby who first measured radiocarbon’s rate of decay and established 5568 years ± 30 years as the half-life. Libby was awarded the Nobel Prize in Chemistry in recognition of his efforts to develop radiocarbon dating.

Radiocarbon, or carbon 14, is an isotope of the element carbon that is unstable and weakly radioactive. Carbon 14 is continually being formed in the upper atmosphere by the effect of cosmic ray neutrons on nitrogen 14 atoms.

It is rapidly oxidized in air to form carbon dioxide and enters the global carbon cycle.

Plants and animals assimilate carbon 14 from carbon dioxide throughout their lifetimes.

The archaeological record is important, as it reveals that many aspects of Aboriginal life changed over time, and people did not always use the same tools and subsistence technologies that were observed when the British arrived.

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American physical chemist Willard Libby led a team of scientists in the post World War II era to develop a method that measures radiocarbon activity.When they die, they stop exchanging carbon with the biosphere and their carbon 14 content then starts to decrease at a rate determined by the law of radioactive decay.The evidence against a recent creation is overwhelming.Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. cite web | url= | title = Archaeological evidence of Aboriginal life in Sydney | author = Attenbrow, Val | date = 2012 | work = Dictionary of Sydney | publisher = Dictionary of Sydney Trust | accessdate = Today, [media]the Sydney region has a large Aboriginal population, many of whom are descendants of the original inhabitants who lived here when Captain Cook visited in 1770 and the First Fleet arrived in 1788.

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