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This half life is a relatively small number, which means that carbon 14 dating is not particularly helpful for very recent deaths and deaths more than 50,000 years ago.If, in the year AD 1600, you had asked an educated European how old the planet Earth was and to recount its history he would have said that it was about 6000 years old and that its ancient history was given by the biblical account in Genesis.Experts can compare the ratio of carbon 12 to carbon 14 in dead material to the ratio when the organism was alive to estimate the date of its death.Radiocarbon dating can be used on samples of bone, cloth, wood and plant fibers.At any particular time all living organisms have approximately the same ratio of carbon 12 to carbon 14 in their tissues.When an organism dies it ceases to replenish carbon in its tissues and the decay of carbon 14 to nitrogen 14 changes the ratio of carbon 12 to carbon 14.

In the case of radiocarbon dating, the half-life of carbon 14 is 5,730 years.

These were long on armchair speculation and short on substantive supporting evidence.

These cosmogonies were part of the new emphasis of science in seeking rational explanations of the features of the world. This period was marked by a great deal of field geology rather than grand cosmogonies.

Radiocarbon dating has been one of the most significant discoveries in 20th century science.

Renfrew (1973) called it 'the radiocarbon revolution' in describing its impact upon the human sciences.




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