Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/77637
Type: Artigo de periódico
Title: Anthropogenic source assessment of Ra-226 and Pb-210 in a sediment core from the Cubato River estuary (SE Brazil)
Author: Sanders, LM
Sanders, CJ
Luiz-Silva, W
Machado, W
Silva, EV
Patchineelam, SR
Abstract: A sediment core from an estuarine area receiving drainage from the highly industrialized Cubato River basin (SE Brazil) showed Ra-226 and Pb-210 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 Ra-226 and Pb-210 activities are affected by fertilizer industry-derived inputs in addition to natural sources. This interpretation was supported by Pb-210/Ra-226 ratios (found to be between 2.6 and 3.9) that indicate disequilibrium between Ra-226 and its decay product Pb-210, as expected for phosphogypsum-affected sediments.
Subject: Estuarine sediments
Radiochemical contamination
Pb-210
Ra-226
Country: Holanda
Editor: Springer
Rights: fechado
Identifier DOI: 10.1007/s10967-010-0813-0
Date Issue: 2011
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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