SANDRA REGINA DAMATTO

SANDRA REGINA DAMATTO

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Natural and artificial nuclides in Salesópolis reservoir
2019 - SILVA, P.S.C.; SEMMLER, R.; ZAHN, G.S.; ROCHA, F.R.; DAMATTO, S.R.; FAVARO, D.I.T.
Natural radioactivity is ubiquitous in the environment mainly due to the presence of the nuclides from the ura-nium and thorium series and 40K. Although in the South Hemisphere nuclear tests have been fewer in number than that in the North, artificial radionuclides can also be found spread at ground level. In this study, the activity concentrations of natural nuclides from the uranium and thorium series, 40K and the artificial 137Cs were deter-mined in a sediment core with 42 cm depth collected in the middle of the Salesópolis reservoir, located in the Metropolitan Region of São Paulo city (SPMR). The Usina Parque Rio Tietê reservoir belongs to the Alto do Tietê system for the capture, storage and treatment of water for SPMR. Therefore, the quality of the water and sediments of this dam is of great importance. The activity concentrations were measured by gamma spectrome-try. Samples were measured and saved at regular intervals at a maximum of 160 000 seconds. The gross area were determined for each peak and plotted against time and the counting rate was obtained by the slope of the curve. Background and reference materials were also counted and treated in the same way. Results showed that 226Ra varied from 45 to 116 Bq kg-1; 228Ra, from 80 to 165 Bq kg-1; 40K, from 155 to 1 187 Bq kg-1 and 137Cs varied from 0.3 to 7 Bq kg-1. The methodology applied for determining low levels of 137Cs in sediment proved to be effi-cient and reproducible.
Trace elements by neutron activation analysis in three sediments cores from the Alto Tietê River sub-basin, São Paulo-Brazil, dated by 210Pb method
2015 - FAVARO, DEBORAH; ROCHA, FLAVIO; DAMATTO, SANDRA R.; WAKASUGI, DENISE; SILVA, PAULO S.
Study of the U and Th series in Crassostrea mangle shell
2015 - FARIAS, WELLINGTON M.; DAMATTO, SANDRA R.; SIMONE, LUIZ R.L.; AMARAL, VANESSA S.; SILVA, PAULO S.C.
Sedimentation rates by sup(210) Pb method and trace elements by INAA in two sediment cores from the Tiete river, São Paulo, Brazil
2014 - DAMATTO, SANDRA R.; ROCHA, FLAVIO R.; BAUMGARDT, DAIANE; CASTRO, LUCAS M.; TAPPIZ, BRUNO; SILVA, PAULO S.C. da; FAVARO, DEBORAH I.T.
Sequential determination of U and Th decay series in Santana Cave, Southwest Brazil
2008 - SILVA, P.S.C.; DAMATTO, S.R.; MAZZILLI, B.P.
Metal distribution in sediment cores from São Paulo state coast, Brazil
2011 - SILVA, PAULO S.C.; DAMATTO, SANDRA R.; FAVARO, DEBORAH I.T.; MAZZILLI, BARBARA P.
Radiological study in caves of Southwest Brazil
2008 - ALBERIGUI, S.; SILVA, P.S.C.; CAMPOS, M.P.; DAMATTO, S.R.M.; PECEQUILO, B.R.; MAZZILLI, B.P.
The Parque Estadual Turístico do Alto Ribeira (PETAR) is located in the Southwestern part of São Paulo State, in Ribeira Valley. In this region is found the major number of cave occurrence in Brazil and also shelters the most visited caves of the country. Caves, usually located in a karstic zone, are characterized by the presence of carbonaceous rocks frequently fractured and collapsed. Carbonates (dolomites and calcite rocks) usually have low U and Th, however, surrounding rocks can be found containing in structural positions U and Th. Radon generated in these rocks may migrate in the subsoil penetrating this carbonate due to its greater permeability causing high radon concentration. It is known that radon emission depends on conditions of the local micrometerology, geological factors and the concentration of U and Th Decay series. In the sense to understand the radon concentrations in these caves, the objective oh this paper is to determine the 238U, 232Th, 226Ra, 228Ra and 210Po in rock, soil and sediment samples by alpha spectrometry and total alpha and beta measurement. The concentrations of radon and thoron in the air’s cave were determined in air by solid state nuclear track detectors. As a complementary study neutron activation analysis also were performed in soil, rock and sediment samples. Six of the most visited caves, named Santana, Água Suja, Morro Preto, Couto, Alambari and Laje Branca were studied. High radon concentrations were found in Santana Cave, the same with higher concentrations of U and Th.
Determination of elementary basal levels in sediments of Baixada Santista, Sao Paulo, Brazil
2008 - SILVA, PAULO S.C.; DAMATTO, S.R.; FAVARO, DEBORAH I.T.; MAZZILLI, BARBARA P.
Trace elements in sediments from ponds in Pantanal, Matyo Grosso do Sul, Brasil
2008 - DAMATTO, SANDRA R.; SILVA, PAULO S.C.; MAZZILLI, BARBARA P.; SAKAMOTO, ARNALDO Y.; FAVARO, DEBORAH I.T.
Radioactive and stable elements concentrations in medicinal plants from Brazil
2008 - SUSSA, F.V.; SILVA, P.S.C.; DAMATTO, S.R.; FAVARO, D.I.T.; MAZZILLI, B.P.