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Radiocarbon dating has made a substantive contribution to our understanding of Colorado prehistory by allowing archaeologists to place excavated sites in chronological order and allowing comparison of contemporary archaeological cultures.

While Willard Libby received the Nobel Prize in Chemistry in 1960 for his contributions to the development of the radiocarbon dating method, the process that led to the discovery of this method began much earlier.

Radiocarbon dating is useful for dating organic materials as old as 45,000 to 50,000 years, after which little C atoms in a sample decay.

Research Scientist at the NSF Arizona AMS Facility and Department of Geosciences at the University of Arizona, in Tucson, Ariz. Its primary use is for radiocarbon dating of small samples of carbon, although many measurements have also been made on the longer-lived radionuclides such as I, which have applications to geology and marine studies.

This article is reproduced from Nuclear News, June 19998, and is based on a paper presented at the ANS Winter Meeting, held November 16-20, 1997, in Albuquerquete N. AMS has become an accurate and precise method for dating many types of materials - including such interesting items as the Shroud of Turin and the Dead Sea Scrolls, which will be discussed later—where only a small sample can be spared.

The isotope, Carbon-14, abbreviated as C in a sample.

The first radiocarbon studies conducted by Libby focused on a variety of organic materials whose age was known or suggested through previous research.

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