Anthropogenic source assessment of 226Ra and 210Pb in a sediment core from the Cubatão River estuary (SE Brazil)

  • L. M. Sanders
  • C. J. Sanders
  • W. Luiz-Silva
  • W. Machado
  • E. V. Silva-Filho
  • S. R. Patchineelam
Article

Abstract

A sediment core from an estuarine area receiving drainage from the highly industrialized Cubatão River basin (SE Brazil) showed 226Ra and 210Pb activities up to 80 and 213 Bq kg−1, respectively, which are greater than activities considered as regional background levels. Radionuclides and the elevated phosphorus concentrations (up to 0.3% sediment dry weight) found along the sediment core were significantly correlated with each other, indicating source similarity. These results indicate that 226Ra and 210Pb activities are affected by fertilizer industry-derived inputs in addition to natural sources. This interpretation was supported by 210Pb/226Ra ratios (found to be between 2.6 and 3.9) that indicate disequilibrium between 226Ra and its decay product 210Pb, as expected for phosphogypsum-affected sediments.

Keywords

Estuarine sediments Radiochemical contamination 210Pb 226Ra 

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2010

Authors and Affiliations

  • L. M. Sanders
    • 1
  • C. J. Sanders
    • 3
  • W. Luiz-Silva
    • 2
  • W. Machado
    • 3
  • E. V. Silva-Filho
    • 3
  • S. R. Patchineelam
    • 3
  1. 1.Instituto de Radioproteção e Dosimetria (IRD)Rio de JaneiroBrazil
  2. 2.Instituto de Geociências, Universidade Estadual de CampinasCampinasBrazil
  3. 3.Departamento de GeoquímicaInstituto de Química, Universidade Federal FluminenseNiteróiBrazil

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