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Radiocarbon Dating. Radiometric Dating, Radionuclide, Before Present, Beta Decay, Exponential Decay, Carbon-14, Age of the Earth, Environmental Radioactivity, Willard Libby, Hessel de Vries, Calibration Curve, Half-Life, Enrico Fermi, Article Sources and Contributors, Image Sources, Licenses and Contributors ... Read more

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This digital document is a journal article from Journal of Environmental Radioactivity, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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Sambaqui means, in the Tupi language, a hill of shells. The sambaquis are archaeological sites with remains of pre-historical Brazilian occupation. Since the sambaqui sites in the Rio de Janeiro state region are older than 10,000 years, the applicability of CO"2 absorption on Carbo-sorb^(R) and ^1^4C determination by counting on a low background liquid scintillation counter was tested. In the present work, sambaqui shells were treated with H"3PO"4 in a closed vessel in order to generate CO"2. The produced CO"2 was absorbed on Carbo-sorb^(R). On saturation about 0.6g of carbon, as CO"2, was mixed with commercial liquid scintillation cocktail (Permafluor^(R)), and the ^1^4C activity determined by counting on a low background counter, Packard Tricarb 3170 TR/SL, for a period of 1000mins to enable detection of a radiocarbon age of 22,400 BP. But only samples with ages up to 3500 BP were submitted to the method because the samples had been collected in the municipality of Guapimirim, in archaeological sambaqui-type sites belonging to this age range. The same samples were sent to the ^1^4C Laboratory of the Centro de Energia Nuclear na Agricultura (CENA/USP) where similar results were obtained.were obtained. ... Read more