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Datação radiocarbônica de sítios arqueológicos do tipo sambaqui pela técnica de absorção de CO2: uma alternativa à síntese benzênica

2004; Brazilian Chemical Society; Volume: 27; Issue: 2 Linguagem: Inglês

10.1590/s0100-40422004000200026

1678-7064

Maria Lucia Teixeira Guerra de Mendonça, José Marcus Godoy,

Radioactivity and Radon Measurements

BENZENE SYNTHESIS: The sambaquis are archaeological sites with remains of pre-historical Brazilian civilizations.They look like small hills containing different kinds of shells, animal and fish bones, small artifacts and even human skeletons.Since the sambaqui sites in the Rio de Janeiro state are younger than 6000 years, the applicability of CO 2 absorption on Carbo-Sorb ® and 14 C determination by counting on a low background liquid scintillation counter was tested.The International Atomic Energy Agency standard reference material IAEA-C2 was used in order to standardize the method.Nine sambaqui samples from five different archaeological sites found in the Rio de Janeiro state were analyzed and 14 C ages between 2100 and 3600 years BP were observed.The same samples were sent to the 14 C Laboratory of the Centro de Energia Nuclear na Agricultura (CENA/USP) where similar results were obtained.