Rate of sedimentary in the coastal systems and on the souther continental plataform of the state of São Paulo, Brazil

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dc.contributor.authorTESSLER, M.G.
dc.contributor.authorCUNHA, I.I.L.
dc.contributor.authorSAITO, R.T.
dc.contributor.authorFIGUEIRA, R.C.
dc.coverageInternacionalpt_BR
dc.creator.eventoINTERNATIONAL GEOLOGICAL CONGRESS, 31stpt_BR
dc.date.accessioned2015-11-18T12:33:43Z
dc.date.available2015-11-18T12:33:43Z
dc.date.eventoAugust 6-17, 2000pt_BR
dc.description.abstractAnalyses of the concentrations of the natural radionuclideos 210Pb and 226 Ra, scattered in the environment in vestigial amounts in witnesses of the coastal and occeanic areas provide a historical record of events and make it possible to estimate the background and variations in the volume of sediments laid down extensive periods of time. The results of the analyses of the rates of sedimentation obtained in the coastal systems (Cananeia-Igaupe system) and the souther continental platform of the state of São Paulo, by means of the calculation of the 210Pb and 226Ra by gama spectrometry, are presented in this study.A detector of hyperpure Germanium with a low level of bottom radiation and a study of the phototype of these radionuclideos was used for the analysis of these same radionuclideos in the marine sediments. The analysis of the 210Pb was undertaken by means of the gama emission of 47Kev and that of 226Ra by the gama emission of the Bi (609 Kev). Additionally a sedimentation rate was calculated for purposes of comparison on the basis of the levels of 137 Cs present in the witnesses, the biennium 1963/1964 being taken as the maximum pcak of atmospheric emission by nuclear explosions as from witch time on the atmospheric emission of this radionuclid diminishes and its rate of deposition on the earth’s crust is considered constant. The rates of sedimentation obtained for the coastal system show agreement of the values obtained for 210Pb (5.33mm/yr) with those obtained through the dating method for 137Cs (5.46mm/yr). The sedimentation rates obtained for the continental platform correspond to values some five times inferior to those obtained in the coastal systems.
dc.identifier.citationTESSLER, M.G.; CUNHA, I.I.L.; SAITO, R.T.; FIGUEIRA, R.C. Rate of sedimentary in the coastal systems and on the souther continental plataform of the state of São Paulo, Brazil. In: INTERNATIONAL GEOLOGICAL CONGRESS, 31st, August 6-17, 2000, Rio de Janeiro, RJ. <b>Abstract...</b> Disponível em: http://repositorio.ipen.br/handle/123456789/25240.
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/25240
dc.local.eventoRio de Janeiro, RJpt_BR
dc.rightsopenAccesspt_BR
dc.subjectsedimentation
dc.subjectcoastal regions
dc.subjectbrazil
dc.subjectradioisotopes
dc.titleRate of sedimentary in the coastal systems and on the souther continental plataform of the state of São Paulo, Brazilpt_BR
dc.typeResumo de eventos científicospt_BR
dspace.entity.typePublication
ipen.autorIEDA IRMA LAMAS CUNHA
ipen.codigoautor1217
ipen.contributor.ipenauthorIEDA IRMA LAMAS CUNHA
ipen.date.recebimento15-03pt_BR
ipen.event.datapadronizada2000pt_BR
ipen.identifier.ipendoc17431pt_BR
ipen.notas.internasAbstractpt_BR
ipen.type.genreResumo
relation.isAuthorOfPublicationc0c1daef-c00c-4ab2-859a-ceba5ca33fc8
relation.isAuthorOfPublication.latestForDiscoveryc0c1daef-c00c-4ab2-859a-ceba5ca33fc8
sigepi.autor.atividadeCUNHA, I.I.L.:1217:-1:N
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