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210Pb and 137Cs geochronologies in the Cananeia-Iguape Estuary (Săo Paulo, Brazil)

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Abstract

Sediment cores were collected at the Cananeia-Iguape Estuary and thelevels of 210Pb, 226Ra and 137Cs were measuredby gamma-ray spectrometry. The total 210Pb levels in sedimentsvaried from 13.5 to 122.5 Bq . kg —1 , for 226Raranged from 2.4 to 28 Bq . kg —1 and for 137Csfrom 0.28 to 6.1 Bq . kg —1 . Sedimentation rates were calculatedfrom the slope of the excess 210Pb profile in the core. The valuesobtained varied from 5 to 10 mm . y—1 , depending on thesediment deposition inputs in the local of sampling.

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Authors and Affiliations

  1. Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN-SP, Caixa Postal 11049, Pinheiros, Săo Paulo, Brasil

    I. I. L. Cunha

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  1. I. I. L. Cunha
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Cunha, I.I.L. 210Pb and 137Cs geochronologies in the Cananeia-Iguape Estuary (Săo Paulo, Brazil). Journal of Radioanalytical and Nuclear Chemistry 249, 257–261 (2001). https://doi.org/10.1023/A:1013219332322

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  • DOI: https://doi.org/10.1023/A:1013219332322

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