Until , when archaeologists dug up prehistoric bones, stone points, charcoal remnants or other artifacts from early human history, they had no way of knowing exactly how old these objects were. Libby and his colleagues based their idea on the fact that living things incorporate tiny amounts of a certain isotope of carbon C from the atmosphere into their structure; when they die, they stop adding new C, and the quantity left inside slowly degrades into a different element, nitrogen
Beyond the specific topic of natural 14 C, it is hoped that this account may serve as a metaphor for young scientists, illustrating that just when a scientific discipline may appear to be approaching maturity, unanticipated metrological advances in their own chosen fields, and unanticipated anthropogenic or natural chemical events in the environment, can spawn new areas of research having exciting theoretical and practical implications. This article is about metrology, the science of measurement.
History, anthropology, and archaeology are three distinct but closely related bodies of knowledge that tell man of his present by virtue of his past. Historians can tell what cultures thrived in different regions and when they disintegrated.
In dead material, the decayed 14C is not replaced and its concentration in the object decreases slowly. To obtain a truly absolute chronology, corrections must be made, provided by measurements on samples of know age.
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