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Back in the 1940s, the American chemist Willard Libby used this fact to determine the ages of organisms long dead.

Most carbon atoms have six protons and six neutrons in their nuclei and are called carbon 12. But a tiny percentage of carbon is made of carbon 14, or radiocarbon, which has six protons and eight neutrons and is not stable: half of any sample of it decays into other atoms after 5,700 years.

At a particular site, there may be present several components, recognized by critical changes in the artifact assemblages.

A number of similar and contemporary components make up a phase..

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Yadin’s findings in the lower city confirm that public structures such as the Orthostats Temple and the Stelae Temple were violently destroyed, while the renewed excavations in the upper city—under current excavator Amnon Ben-Tor—corroborate the existence of a fierce conflagration that also is mostly limited to public buildings.

Carbon 14 is continually being created in the Earth's atmosphere by the interaction of nitrogen and gamma rays from outer space.

Since atmospheric carbon 14 arises at about the same rate that the atom decays, the Earth's levels of carbon 14 have remained constant.

In living organisms, which are always taking in carbon, the levels of carbon 14 likewise stay constant.

But in a dead organism, no new carbon is coming in, and its carbon 14 gradually begins to decay.




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