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https://repositorio.inpa.gov.br/handle/1/17492
Título: | Uranium isotopes in groundwater occurring at Amazonas State, Brazil |
Autor: | Silva, Márcio Luiz da Bonotto, Daniel Marcos |
Palavras-chave: | Dissolution Groundwater Flow Isotopes Nuclear Fuels Uranium Activity Ratios Amazon Area Groundwater Flow Directions Isotope Dilution Technique Reducing Environment Tubewells Uranium Concentration World Health Organization Groundwater Groundwater Uranium 234 Uranium 238 Acidity Alpha Spectrometry Concentration (parameters) Fluid Intake Isotope Dilution Assay Leaching Radioactive Pollution Radioactivity Spectrometry Trend Study Water Analysis Water Flow Water Pollution Water Quality |
Data do documento: | 2015 |
Revista: | Applied Radiation and Isotopes |
É parte de: | Volume 97, Pags. 24-33 |
Abstract: | This paper reports the behavior of the dissolved U-isotopes 238U and 234U in groundwater providing from 15 cities in Amazonas State, Brazil. The isotope dilution technique accompanied by alpha spectrometry were utilized for acquiring the U content and 234U/238U activity ratio (AR) data, 0.01-1.4μgL-1 and 1.0-3.5, respectively. These results suggest that the water is circulating in a reducing environment and leaching strata containing minerals with low uranium concentration. A tendency to increasing ARs values following the groundwater flow direction is identified in Manaus city. The AR also increases according to the SW-NE directions: Uarini→Tefé; Manacapuru→Manaus; Presidente Figueiredo→São Sebastião do Uatumã; and Boa Vista do Ramos→Parintins. Such trends are possibly related to several factors, among them the increasing acid character of the waters. The waters analyzed are used for human consumption and the highest dissolved U content is much lower than the maximum established by the World Health Organization. Therefore, in view of this radiological parameter they can be used for drinking purposes. © 2014 Elsevier Ltd. |
DOI: | 10.1016/j.apradiso.2014.12.012 |
Aparece nas coleções: | Artigos |
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