SANDRA REGINA DAMATTO

SANDRA REGINA DAMATTO

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In situ characterization of NORM waste from the oil industry
2022 - DELLAMANO, J.C.; DAMATTO, S.R.; CARVALHO, R.N.; MENEGHINI, A.A.; MARUMO, J.T.; MADUAR, M.F.; VICENTE, R.
In the oil industry, radioactive wastes are generated in the oil production platforms containing natural radionuclides, such as 226Ra and 228Ra, the NORM waste. This waste is mainly in the form of produced water, sludge and scales which should be characterized for the correct final destination. The Brazilian laws establish that the NORM wastes from the oil production must comply with Law 10308 of November 20, 2001, which determine in its article 7, "The disposal of radioactive waste of any kind in the oceanic islands, the continental shelf and the Brazilian territorial waters is prohibited." Therefore, the NORM waste from offshore oil extraction rigs should be transported to onshore facilities. There are two options for the destination of this material: industrial landfill, in the case of activity concentrations are below clearance limits established by Brazilian Nuclear Commission, CNEN; or on the contrary, to intermediate storage facilities, until final disposal is decided. Currently, the oil production companies take samples from the waste and send them to radiometric laboratories in order to evaluate their activity concentration by gamma spectrometry. The complete process takes more than six months to be concluded. Nuclear and Energy Research Institute, IPEN, is making efforts to solve the management problems of NORM waste from oil extraction, including conduct research aiming at characterizing the waste. The objective of the paper is to present the results of in situ characterization of drums containing oil sludge using portable gamma spectrometers.
Natural radionuclides in soil profiles and sediment cores from Jundiaí reservoir, state of São Paulo
2021 - GONÇALVES, P.N.; DAMATTO, S.R.; LEONARDO, L.; SOUZA, J.M.
The activity concentration of natural radionuclides in soils and sediments is dependent on many factors, such as the rock parental material, pedogenic and weathering processes, physical and chemical properties of the environment, anthropogenic sources, among other aspects. There are few studies about the levels of natural radionuclides in reservoirs in both, international and national, literature. The objective of this paper was to evaluate the activity concentrations of 238U and 232Th by Instrumental Neutron Activation Analysis and 226Ra, 210Pb, 228Ra, 228Th and 40K by gamma spectrometry in two soil profiles and three sediment cores collected in the catchment area of Jundiai reservoir, located in the state of São Paulo, Brazil. Principal component analysis was applied to verify the correlation of the activity concentrations of the natural radionuclides with physical and chemical properties of soil and sediment samples. The mean activity concentrations of the radionuclides in the soil profiles 1 and 2 were, respectively: 238U – 37(1) and 32(1) Bq.kg-1; 232Th – 91(1) and 60(1) Bq.kg-1; 226Ra – 66(1) and 51(1) Bq.kg-1; 210Pb – 35(1) and 37(1) Bq.kg-1; 228Ra – 34(1) and 27(1) Bq.kg-1; 228Th – 78(1) and 58(1) Bq.kg-1; 40K – 96(2) and 171(7) Bq.kg-1. For the three sediment cores analyzed, the average activities concentrations of the radionuclides were, respectively: 238U – 64(0.5), 47(0.1) and 44(0.2) Bq.kg-1; 232Th – 122(2), 100(1) and 64(1) Bq.kg-1; 226Ra – 74(2), 71(1) and 45(1) Bq.kg-1; 210Pb – 70(3), 56(2) and 55(2) Bq.kg-1; 228Ra – 53(1), 41(1) and 33(1) Bq.kg-1; 228Th – 100(2), 92(1) and 63(2); 40K – 316(5), 237(1) and 136(2) Bq.kg-1.
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.
sup(7)Be concentration in air surface over a long period of monitoring in the city of São Paulo, Brazil
2015 - DAMATTO, S.R.; MADUAR, M.F.; PECEQUILO, B.R.S.; NOGUEIRA, P.R.; NISTI, M.B.
Major and trace elements in sediments from Viração Logoon, Fernando de Noronha Archipelago, Brazil
2004 - FAVARO, D.I.T.; OLIVEIRA, S.M.B.; DAMATTO, S.R.; MENOR, E.A.; MORAES, A.S.; MAZZILLI, B.P.
Fernando de Noronha is an isolated group of 21 volcanic islands and located in the South Equatorial Atlantic, approximately 545 km from Recife, PE, Brazil. This archipelago is a protected and isolated habitat with restrict access. Viração Lagoon, a small lake located at Fernando de Noronha Island, 20 meters above the sea level, is a pristine lake located in the main island. The local drainage is restricted and ephemeral, and no connection with the general insular drainage is observed. Two sediment cores (27 and 41 cm-Iong) were extracted in this lagoon in 2000, in order to determine the chemical and mineralogical composition of the sediments. The sediments are made up of smectite, and Fe and Ti oxides. Trace elements As, Ba , Br, Co, Cr, Cs, Rb, Sb , Sc, To , Th , U, Zn and rare earths (Ce, Eu , La , Lu, Nd, Sm, Tb and Vb) were determined by instrumental neutron activation analysis (lNAA). All samples, previously dried at 60oC, were passed through a 0.065 mm sieve. The cores were sliced at every two centimeters. For the multi elemental analyses approximately 200 mg of sediment (duplicate samples) and about 150 mg of reference material and synthetic standards were accurately weighted and sealed in pre-cleaned double polyethylene bags, for irradiation ., Single and multielement synthetic standards were prepared by pipetting convenient aliquots of standard solutions (SPEX CERTIPREP) onto small sheets of Whatman no 41 filter paper. Sediment samples, reference material and synthetic standards were irradiated for 16 hours, under a thermal neutron flux of 1012 n cm-1 s- l in the IEA-R 1 nuclear reactor at Instituto de Pesquisas Energeticas e Nucleares fi IPEN. Two series of counting were made: the first after one-week decay and the second, after 15-20 days. The counting time was 2 hours for each sample and reference material, and 30 min for each synthetic standard. Gamma spectrometry was performed using a Canberra gamma X hyperpure Ge detector and associated electronics, with' a resolution of 0.88 keV and 1.90 keV for 57Co and 60Co, respectively. The validation of this methodology was performed by means of Buffalo River Sediment SRM 2704 (NISD , Soil-7 (lAEA) and BEN (Basalt-IWG-GID reference material analysis. The major elements were determined by XRF technique at IG/USP and the validation was carried out by means of JB-1 a and JG-1 a (Geological Survey of Japan) reference materials analysis. Their concentrations are similar to those reported for NASC (North American Shale Composite), except for Ba, REE , Cr, Zr and Zn , with higher concentrations. Enrichment factors for major and trace elements were calculated , using the composition of the surrounding rock (source of the sediments) as a normalizer. Results show that Cr, U, Th, Rb, and Zn are enriched and Hf, Co, Eu and Tb are depleted relative to the rock.
Seasonal variation of sup(7)Be concentrations measured at ground level air in São Paulo - Brazil
2011 - DAMATTO, S.R.; MADUAR, M.F.; PECEQUILO, B.R.S.; NISTI, M.B.
Assessment of atmospheric pollution in the vicinity of a tin and lead industry using lichen Canoparmelia texana
2008 - LEONARDO, LUCIO; DAMATTO, SANDRA R.; MAZZILLI, BARBARA P.; SAIKI, MITIKO; OLIVEIRA, SONIA M.B. de
Fast methodology for time counting optimization in gamma-ray spectrometry based on preset minimum detectable amounts
2008 - NISTI, M.B.; SANTOS, A.J.G.; PECEQUILO, B.R.S.; MADUAR, M.F.; ALENCAR, M.M.; DAMATTO, S.R.
Be-7 measured at ground air level and rainfall in the city of São Paulo
2013 - DAMATTO, SANDRA R.; SOUZA, JOSEILTON M.; FRUJUELE, JONATAN V.; MADUAR, MARCELO F.; LEONARDO, LUCIO; PECEQUILO, BRIGITTE R.S.
The use of lichen (Canoparmelia texana) as biomonitor of atmospheric deposition of natural radionuclides from U-238 and Th-232 series
2007 - LEONARDO, LUCIO; DAMATTO, SANDRA R.; MAZZILLI, BARBARA P.; SAIKI, MITIKO