IEDA IRMA LAMAS CUNHA
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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.Artigo IPEN-doc 22589 Distribution of 137Cs, 238Pu and 239 + 240Pu in sediments of the southeastern Brazilian shelf–SW Atlantic margin2006 - FIGUEIRA, RUBENS C.L.; TESSLER, MOYSES G.; MAHIQUES, MICHEL M. de; CUNHA, IEDA 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.Resumo IPEN-doc 02303 Estabelecimento de um metodo radioquimico para a separacao de sub (137)Cs de misturas de produtos de fissao1984 - CUNHA, I.I.L.; ANDRADE e SILVA, L.G.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 16795 Assessments of doses to the Brazilian population from radioactive marine food1995 - CUNHA, I.I.L.; RODRIGUES JUNIOR, O.; FIGUEIRA, R.C.L.Artigo IPEN-doc 08303 Simultaneous analysis of sup(137)Cs, sup(90)Sr, sup(238)Pu and sup(239+240)Pu in Brazilian seawater2000 - FIGUEIRA, R.C.L.; SARAIVA, E.S.B.G.; CUNHA, I.I.L.Artigo IPEN-doc 08300 Sup(210)Pb and sup(137)Cs geochronologies in the Cananeia-Iguape Estuary (Sao Paulo, Brazil)2000 - SAITO, R.T.; FIGUEIRA, R.C.L.; TESSLER, M.G.; CUNHA, I.I.L.Artigo IPEN-doc 05430 Sources of radioactivity in the marine environment and their relative contributions to overall dose assessment from marine radioactivity. An IAEA Coordinated research programme1994 - AARKROG, A.; BETTENCOURT, A.O.; BOJANOWSKI, R.; BOLOGA, A.; CHARMASSON, S.; CUNHA, I.I.L.; DELFANTI, R.; DURAN, E.Artigo IPEN-doc 02206 Determination of fallout radionuclides in sediment and biota samples from Antarctica1993 - CUNHA, I.I.L.; SANTOS, A.J.G.; MARCHESE, S.R.M.; MONTONE, R.C.
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