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|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)|
|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.|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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