Radium isotope (223Ra, 224Ra, 226Ra and 228Ra) distribution near Brazil's largest port, Paranaguá Bay, Brazil
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Marine Pollution Bulletin
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This work investigates the 223Ra, 224Ra, 226Ra and 228Ra isotope distribution in river, estuarine waters and sediments
of the Paranaguá Estuarine Complex (PEC). The stratification of the Ra isotopes along water columns indicate
differing natural sources. In sediments, the radium isotope activities was inversely proportional to the
particle size. The highest concentrations of 223Ra, 224Ra, 226Ra and 228Ra in the water column were found in the
bottom more saline waters and towards the inner of the estuary. These relatively high concentrations towards
the bottomof the estuarymay be attributed to the influence of tidally driven groundwater source and desorption
from particles at the maximum turbidity zone. The apparent river water ages from the radium isotope ratios,
223Ra/224Ra and 223Ra/228Ra, indicate that the principal rivers that flow into the estuary have residence times
from between 6 and 11 days.
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DIAS, THAIS H.; OLIVEIRA, JOSELENE de; SANDERS, CHRISTIAN J.; CARVALHO, FRANCIANE; SANDERS, LUCIANA M.; MACHADO, EUNICE C.; SA, FABIAN. Radium isotope (223Ra, 224Ra, 226Ra and 228Ra) distribution near Brazil's largest port, Paranaguá Bay, Brazil. Marine Pollution Bulletin, v. 111, p. 443-448, 2016. DOI: 10.1016/j.marpolbul.2016.07.004. Disponível em: http://repositorio.ipen.br/handle/123456789/26996. Acesso em: 30 Dec 2025.
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