RUBENS CESAR LOPES FIGUEIRA
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Artigo IPEN-doc 22663 A model of recent sedimentation in the Cananeia–Iguape estuary, Brazil2006 - SAITO, R.T.; FIGUEIRA, R.C.L.; TESSLER, M.G.; CUNHA, I.I.L.Coastal systems, in particular estuaries, are the first depositional environment to receive sediments transported by rivers to the coastal ocean. As a consequence of the geochemical processes involved, a part of the sediment may be deposited in the estuary and the remainder flows into the ocean, being transported and deposited under the influence of tides and maritime currents. This study was carried out in the Cananeia–Iguape estuary on the southern coast of São Paulo state, Brazil. The vertical distribution of 210Pb and 137Cs in sediments has been used as a tool for estimating the sedimentation rates in the coastal environment. Concentrations of 210Pb and 137Cs, as well as heavy metals (lead, zinc, copper) were determined in four sediment cores collected in the Cananeia–Iguape estuary. The estimated sedimentation rates were from 5.3 mm yr−1 to 12.7 mm yr−1. The highest sedimentation rate obtained for Valo Grande corresponds with an accelerated expansion of the sand and clay banks of the Mar Pequeno channel, a growth of the mangrove areas, and a decrease in the depth of the main channel of navigation, a fact that has been affecting the navigation in the area very seriously. The data obtained for the metals showed a sedimentary dynamics in agreement with that obtained in the studies of sedimentation rates, thus contributing to the understanding of the hydrodynamic mechanisms of the system.Resumo IPEN-doc 21546 Activity concentration analysis of Ra-226, Ra-228 and Pb-210 in a sedimentary profile of Admiralty Bay, South Shetland archipelago - Antarctica2015 - MORA, TAMIRES de A.; OLIVEIRA, JOSELENE de; FIGUEIRA, RUBENS C.L.Resumo IPEN-doc 21545 Determination of Ra-226, Ra-228 and Pb-210 in sedimentary samples of Admiralty Bay - Antarctica2015 - MORA, TAMIRES de A.; OLIVEIRA, JOSELENE de; FIGUEIRA, RUBENS C.L.Artigo IPEN-doc 21058 Evaluation of the activity concentration of sup(226)Ra, sup(228)Ra and sup(210)Pb in sediments from Antarctica in the Admiralty Bay Region2015 - MORA, TAMIRES de A.; OLIVEIRA, JOSELENE de; FIGUEIRA, RUBENS C.L.; MAHIQUES, MICHEL M.; SOUSA, SILVIA H.M.Artigo IPEN-doc 20973 Inventory of sup(226)Ra, sup(228)Ra and sup(210)Pb in marine sediments cores of southwest atlantic ocean2015 - COSTA, ALICE M.R.; OLIVEIRA, JOSELENE de; FIGUEIRA, RUBENS C.L.; MAHIQUES, MICHEL M.; SOUSA, SILVIA H.M.Resumo IPEN-doc 06318 Metodos analiticos para a determinacao de radionuclideos naturais e artificiais em ambientes marinhos1997 - SAITO, R.T.; FIGUEIRA, R.C.L.; CUNHA, I.I.L.Resumo IPEN-doc 10413 sup(210)Pb, sup(226)Ra and sup(137)Cs levels and sedimentation rate in admiralty bay, antarctic peninsula2005 - FIGUEIRA, R.C.L.; MARTINS, C.C.; MONTONE, R.C.; FIGUEIREDO, A.M.G.; TESSLER, M.G.; MAHIQUES, M.M.; CUNHA, I.I.L.Artigo IPEN-doc 10804 sup(210)Pb and sup(137)Cs levels in marine sediment samples from the southeastern coast of Brazil, South Atlantic area2004 - FIGUEIRA, R.C.L.; TESSLER, M.G.; MAHIQUES, M.M.; ZANINI, K.; SAITO, R.T.; CUNHA, I.I.L.Artigo IPEN-doc 08787 Niveis de sup(210)Pb e sup(210)Po em aguas dos canais do Sistema Costeiro Cananeia-Iguape (Sao Paulo, Brasil)2002 - SAITO, R.T.; FIGUEIRA, R.C.L.; TESSLER, M.G.; CUNHA, I.I.L.Artigo IPEN-doc 08786 Ingestao de sup(210)Pb e sup(210)Po pelo consumo de peixes no Sistema Cananeia-Iguape, Sao Paulo, Brasil2002 - SAITO, R.T.; FIGUEIRA, R.C.L.; TESSLER, M.G.; CUNHA, I.I.L.