Navegação Eventos - Resumos por ano de publicação "2017"

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  • IPEN-DOC 24555

    SARTORI, L.P.; LEONARDO, L. ; DAMATTO, S.R. ; SANTOS, N.D. . Trace elements determined in turtles trachemys scripta elegans from the urban area of São Paulo. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 36-37.

    Abstract: The red-eared-turtle Trachemys scripta elegans, belonging to the suborder Cryptodira and family Emydidae, is farmed in the Mississippi Valley in the USA and sold throughout the world as one of the most traded pets. An increasing number of species are frequently released by owners in natural wetlands and in urban areas. This species is resistant and may spread parasites and threaten native turtle populations. Many countries chose to perform euthanasia to control its population, avoiding the threat to local biodiversity. Animals were studied here using Instrumental Neutron Activation Analysis (INAA) to determine metallic elements Ca, Fe, Na, Zn, aiming to assess the concentrations on different tissues in the body of ten female specimens. All of them donated already euthanized by DEPAVE (Parks and Green Areas Department) U City of São Paulo. The bodies were open with electric saw, with size between 18 and 23 cm of Carapace Length (CL), being all of them adults. The samples analyzed were: superficial and bone carapaces liver, heart, lung, muscle and kidneys. Approximately 200mg of the samples and reference materials, Soil 1 from IAEA and Montana II soil from NIST, were used. Those were irradiated at the IEA-R1 nuclear research reactor at IPEN under a thermal neutron flux of 1012 n per cm2 per s for 6h. Gamma spectrometry was used with a HPGe with relative efficiency of 23% with an associated electronics, to perform the measurements. Methodology validation regarding precision and accuracy were done using reference materials SL- 1 (Lake Sediment – IAEA) and Montana II soils (NIST). The Na, Ca, Zn and Fe concentrations in shell bone and scute were in the same magnitude founded in the literature. The majority of their growth occurs in early years of life then it would be possible to infer that the concentrations found in the central part of their carapace were related to previous years, and the concentrations that were found in the edges can be related to the last months of animals life. Studies regarding cadmium intake focuses in contamination based on animals diet, but as in this study there is few information about the food source the animal received before living in city parks, and before being euthanized they were put in a diet restricted to ration. The Zn concentrations found in the carapace showed higher values in the scute when compared with shell bone. Ca and Na presented the opposite behavior. Future studies related to the metal concentrations in other parts of the animals could indicate the possibility of using this specie as an environmental bioindicator.

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  • IPEN-DOC 24567

    DAMATTO, S.R. ; SANTOS, L.F. . Trace elements determined in sediment cores from Nhecolãndia Pantanal by INAA. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 47-48.

    Abstract: Pantanal wetland is the world’s largest wetland, with an estimated area of about 200 000km2. This region is an alluvial plain and the Paraguay River and his tributaries run through the wetland due to the low declivity of the plain in the north-south and east-west direction; the water takes almost four months to cross the wetland, forming different ecosystems, such as floodplains, lakes of fresh or saline water, rivers, and others. In the last decades, this area has been affected by human activities, without the suitable planning. The sediment of an aqueous system represents a great source of study, as it is a deposit of solid material, formed by the wind, ice, or water on the surface of the earth and the deposition of organic material from animals that live there. From the sediment chemical analysis in combination with geochemical tools is possible to estimate a probable source of the elements chemistry, whether natural or anthropogenic. Trace elements from different sources tend to accumulate in the sediment fine fraction (silt + clay), and are commonly mobile, what could generate a transference of some metals to the environment. Therefore, the present work analyzed the fine (silt + clay) and the coarse (medium sand + fine sand) fraction of the sediment cores collected in four Salinas from Nhecolãndia Pantanal performing the elementary chemical characterization of these sediment fractions and verify a possible historical impact by anthropogenic sources and also to verify if some element could accumulate in the sand fraction since the sediments from these ponds have a high percentage of the coarse (sand) fraction; instrumental neutron activation analysis technique (INAA) was used in the determination. Four sediment cores were collected in ponds located at Embrapa farm, 19 33023:31"S and 56 4057:56"W in Nhecol andia Pantanal, Mato Grosso do Sul, using a PVC manual sediment sampler. The cores were slice every 2cm and dried at 50 C; after drying, the samples were ground and homogenized. The elements As, Ba, Ca, Ce, Co, Cr, Cs, Eu, Fe (%), Hf, K (%), La, Lu, Na, Nd, Rb, Sb, Sc, Se, Sm, Ta, Tb, Th, U, Yb, and Zn were determined (mg kg􀀀1) by Instrumental Neutron Activation Analysis (INAA) and the analysis were performed in the coarse and in the fine fraction of the sediment. The samples and reference material were irradiated for 8h at the IPEN Research Reactor IEA-R1. The element As, Ba and Fe concentrations showed higher values than those of the Upper Continental Crust, UCC, in the fine fraction of the sediment for the studied cores. For the coarse fraction only the elements As, Ba and Hf showed concentrations higher than the UCC values. The majority of the obtained results in the INAA determination for the coarse and fine fraction suggested that there is no expressive effect of the human activities in the region and this particular area until the moment.

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  • IPEN-DOC 24541

    WAKASUGI, D.S.M. ; SHIGASI, A. ; DAMATTO, S.R. . Trace elements determined in mineral waters using INAA from Parque das Águas de Lambari and Contendas. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 25-26.

    Abstract: Mineral water, according to the Brazilian Law N 7.841 of August 8, 1945, "are those from natural springs or springs artificially captured that have chemical composition or physical or physicochemical properties other than ordinary waters, with characteristics that give them a drug action". In this same law, mineral waters can be classified according to their chemical composition in: oligomineral, radiferous, alkaline-bicarbonated, alkalineearthy, sulfated, sulphurous, nitrated, chlorinated, ferruginous, radioactive, thorioactive and carbogasous. In several Brazilian hydromineral resorts, springs of radioactive mineral water are commercially exploited and are consumed by the population that believes this practice is beneficial. For example, in thermal parks like Caxambu, Cambuquira, São Lourenço and Lambari (MG), the waters of the various springs are used for human consumption and are often associated with medicinal use, like diuretic and cathartic waters (with properties of cleaning, purification, facilitating hepato-biliary functions and stimulating intestinal function directly or indirectly), and waters with antiphlogistic properties (anti-inflammatory). Therefore, due to the recommendation of these waters as a form of treatment spent in spas, the present work was developed in Centro de Radiometria Ambiental – IPEN, with the aid of those responsible for the spas of Lambari and Águas de Contendas and, with the objective to perform an inorganic chemical characterization of the mineral waters of Parque das Águas of Lambari and Águas de Contendas. Samples of mineral waters were analyzed in duplicates and concentrated from 500 mL. The samples were irradiated at the IPEN Research Reactor IEA-R1, for a period of 6h under a thermal neutron flux of 1012 n cm􀀀2s􀀀1. In the samples of mineral waters of the Parque das Águas of Águas de Contendas the elements Ca, Co, Fe, Hf, K, Na, Rb, Sb, Sc, Th, Zn, La and Sm were found. Similarly, in the Parque das Águas of Lambari the elements Ca, Co, Fe, K, Na, Rb, Sb, Sc, Zn, La and Sm were found. The analysis of the samples of these water parks evidenced that the elements of greatest occurrence were La and Co.

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  • IPEN-DOC 27055

    CUNICO, P.; FUNGARO, D.A. ; KUMAR, A.. Toxicity studies applied to evaluate the modified zeolites adsorbent for treating copper-complex dyes from simulated dyehouse wastewater. In: SETAC LATIN AMERICA BIENNIAL MEETING, 12th, September 7-10, 2017, Santos, SP. Abstract... 2017. p. 35-36.

    Abstract: Textile dyes occur in wastewaters in different concentrations due to their poor fixation to fabrics. Even at low concentrations, textile dyes can cause waste streams to become highly colored. Aside from their negative aesthetic effects, certain textile dyes have been shown to be toxic, and in some cases, these compounds are carcinogenic and mutagenic. Zeolite synthesized from fly and bottom ashes and modified with hexadecyltrimethylamonium (ZMF and ZMB, respectively) were used as adsorbent to remove dyes - Solophenyl Navy and Solophenyl Turquoise and their hydrolyzed forms Solophenyl Navy Hydrolyzed and Solophenyl Turquoise Hydrolyzed, respectively, from simulated textile wastewater. The purpose of the research was to use bioassays with Lemna minor, Ceriodaphnia dubia and Chironomus tepperi to determine the acute and chronic toxicity of these dyes before and after adsorption process. The acute results indicated C. tepperi showed to be less sensitive when compared with other test organisms, showing values of 48hLC50 70.8 and 211 mgL-1 for SN and ST. On the other hand, C. dubia showed to be very sensitive to the dyes tested (48hLC50 1.25; 54.5; 0.78 and 2.56 mgL-1 for SN, ST, SNH and STH), while L. minor presented response for higher concentration of the dyes, as chlorosis, loss of roots, reduction of the size and etc., showing values of EC50 of 18.9; 69.4; 10.9 and 70.9 mgL-1 for SN, ST, SNH and STH). Chronic tests with C. tepperi showed changes in survival, growth, development and gender differences for SN and ST dyes. After adsorption treatment with ZMF the acute effects were substantially reduced for both dyes and their hydrolyzed forms, showing absence of toxicity after treatment. However, the treatment with ZMB showed no difference and/or increased toxicity in some cases. Toxicity Identification Evaluation testes were realized and showed the baseline acute effects were substantially reduced after treatment with Ethylenediaminetetraacetic acid, showing the most of the toxicants in this study are cations metals. These experimental results suggest both dyes, raw and hydrolyzed, are toxic and their removal are necessary.

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  • IPEN-DOC 23055

    BORRELY, S. ; FUNGARO, D. . Toxicity assays applications for assessing acute effects for radiation decomposition of organics in waters. In: INTERNATIONAL CONFERENCE ON APPLICATIONS OF RADIATION SCIENCE AND TECHNOLOGY, April 24-28, 2017, Vienna, Austria. Abstract... Vienna: IAEA, 2017. p. 108-108.

    Abstract: The knowledge for using electron bem irradiation for pollutants degradation is developing. Textile effluents and pharmaceuticals were the samples submitted to irradiations and to acute toxicity assays. An electron beam accelerator was the radiation source used for the treatment in batch experiments. Dafnids, rotifers and bacteria were applied for toxicity measurements. All the assays were performed at LEBA/IPEN (Environmental Biological Assays Laboratory). Doses required for decomposition of organics in water and related toxicity indicated that reduced colour of effluents with 2:5 kGy and 5 kGy. These doses were also suitable for toxic effects removal at pharmaceutical solutions (fluoxetine in sewage; propranolol and fluoxetine mixture and at fluoxetine and voltaren mixture). Part of real textile effluent (about 35% of samples) were very toxic (CE50   5%) for daphnids and luminescence Vibrio fischeri. The surfactants contained at textile effluent were the most toxic compound. Vibrio fischeri luminescence was confirmed as one of the most sensitive assay, followed by Ceriodaphnia dubia, Brachionus plicatis rotifers and Daphnia similis.

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  • IPEN-DOC 24527

    LUZ, H.N. da; SOUZA, F.A. ; SERRA FILHO, L.A.; MORALLES, M. ; BREGANT, M.; CARLIN, N.; HOGLUND, C.; MUNHOZ, M.G.; SCHMIDT, S.; SUAIDE, A.A.P.; SVENSSON, P.O.. Towards position sensitive thermal neutron detection based in multilayer 10B converters. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 13-13.

    Abstract: One of the most relevant issues in neutron detection is the search for alternatives to 3He as neutron converter. Its high absorption cross section for thermal neutrons used to make it the preferred absorber to build large area thermal neutron detectors. Its current unavailability triggered an intense search to find alternatives like gaseous detectors coated with 10B for neutron conversion. Such element is found in the solid state at NPT presenting an additional challenge regarding its deposition on surfaces with an optimum thickness. This is a critical parameter of the detector, since issues such as the self-absorption of the products of the nuclear reaction when the films are too thick can limit the detection efficiency of the final detector. The use of many layers is an interesting solution to overcome these issues. This has been tried in several geometries, such as Multi-grid, Inclined detector, Jalousie and Cascade. In this presentation, a solution based in the Cascade concept where several thin boron layers are used, will be presented, using a cost effective Micropattern Gaseous Detector, the Thick-Gas Electron Multiplier (Thick-GEM), as neutron converter and electron transporter, together with a standard GEM-based charge amplification stage. Preliminary results obtained with a first prototype mounted at IPEN’s research reactor, using 10B4C neutron converters produced in the deposition lab of the European Spallation Source will be shown and further developments towards position sensitive detection both for beam monitors and for high efficiency neutron detectors will be discussed.

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  • IPEN-DOC 24460

    FAUSTINO, MAINARA G. ; LANGE, CAMILA N. ; MONTEIRO, LUCILENA R. ; FURUSAWA, HELIO A. ; MARQUES, JOYCE R. ; STELLATO, THAMIRIS B. ; SOARES, SABRINA M.V.; SILVA, TATIANE B. de S.C. da ; SILVA, DOUGLAS B. da ; COTRIM, MARYCEL E.B. ; PIRES, MARIA A.F. . Top down Arsenic uncertainty measurement in water and sediments from Guarapiranga Dam (Brazil). In: CONGRESSO BRASILEIRO DE METROLOGIA, 9.; CONGRESSO INTERNACIONAL DE METROLOGIA MECANICA, 4.; CONGRESSO INTERNACIONAL DE METROLOGIA ELETRICA, 12.; CONGRESSO BRASILEIRO DE METROLOGIA DAS RADIAÇOES IONIZANTES, 4.; WORKSHOP DA REDE DE METROLOGIA QUIMICA DO INMETRO, 3.; CONGRESSO BRASILEIRO DE METROLOGIA OPTICA, 2., 26-29 de novembro, 2017, Fortaleza, CE. Resumo... Rio de Janeiro, RJ: Sociedade Brasileira de Metrologia, 2017. p. 117-117.

    Palavras-Chave: arsenic; water pollution monitors; sediments; dams; water reservoirs; sediment-water interfaces; quality control; measuring instruments; standards

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  • IPEN-DOC 24507

    JUNOT, D.O.; SANTOS, A.G.M.; CALDAS, L.V.E. ; SOUZA, D.N.. TL/OSL properties of CaSO4:Tm and CaSO4:Tm,Ag crystals. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th, August 27 - September 01, 2017, João Pessoa, PB. Abstract... 2017. p. 253-253.

    Abstract: Thermoluminescence (TL) is a useful technique to measure ionizing radiation. Nowadays, optically stimulated luminescence (OSL) technique has been also used in this type of monitoring, mostly because of no need of heating samples. Thus, the motivation of this work was to produce TL/OSL dosimeters based on crystals of CaSO4 doped with thulium and silver, by means of a suitable new route. The crystals were produced by an adaptation of the slow evaporation route using calcium carbonate (CaCO3) as precursor, and incorporating the dopants (Tm2O3, and silver nanoparticles) in a solution of sulfuric acid, which is evaporated resulting in CaSO4:Tm or CaSO4:Tm,Ag crystal powder. X-ray diffraction analyses showed that produced samples exhibit only a single phase corresponding to the crystal structure of anhydrite. Radioluminescence confirmed the presence of Tm3+ in the crystal matrix. TL/OSL characteristics such as glow curves, linearity, reproducibility, fading, kinetics order, and activation energy were evaluated. Samples doped with Tm and silver nanoparticles have shown the highest TL intensity and lowest fading, and were compared with commercial TLDs (TLD-100, TLD-900).

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  • IPEN-DOC 24512

    ALMEIDA, S.B. ; SAKURABA, R.K.; REZENDE, A.C.P.; CAMPOS, L.L. . TL and OSL dosimetric characterization of different luminescent materials for clinical electron beams application in TSI treatments. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th, August 27 - September 01, 2017, João Pessoa, PB. Abstract... 2017. p. 329-329.

    Abstract: Thermoluminescent dosimeters (DTLs) play an important role in radiotherapy for the dosimetry of ionizing radiation. This type of dosimeter presents advantages that makes them a useful tool, in particular, for measurements in anthropomorphic simulators and for dosimetry in vivo in patients. Several dosimetric materials have been used in the radiotherapy sectors such as LiF, LiF, CaSO4:Dy(1,2). The OSL dosimetry has also been widely used using Aluminum Oxide (Al2O3: C). These dosimeters have advantages over DTLs due to their high sensitivity, extensive linearity in response to the dose, faster readability, possibility of multiple re-readings and the need to perform the heat treatment of the samples(3). The objective of this work was to characterize the TL and OSL techniques using different luminescent dosimeters (LiF, LiF, CaSO4:Dy and Al2O3:C) to be applied in clinical electron beam used to TSI (Total Skin Irradiation) treatments. Parameters such as dose response curve, that presented linear behavior in the dose range studied; mean sensitivity of the dosimeters, that demonstrated constant values in the dose range analyzed: 28,7 cGy to 382,8 cGy were evaluated. Other parameters also studied were the angular dependence of the TL and OSL response and the intrinsic efficiency of the materials. The Al2O3:C dosimeters presented variation of the OSL response greater than the other dosimeters, probably, due to their thickness 0,9 mm.

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  • IPEN-DOC 26977

    BONICIO, HERMANO A.; FLORIO, DANIEL de; FONSECA, FABIO C. . Thin layer deposition through Ink Jet technology, for application in SOFC. In: BRAZIL MRS MEETING, 16th, September 10-14, 2017, Gramado, RS. Abstract... São Carlos, SP: Aptor Software, 2017. p. 1311-1311.

    Abstract: In the present work, the objective is to develop a film deposition technique with micrometric thickness. For this, the adaptation of a commercial inkjet printer was done by designing and constructing a base with rails so that it runs over the sample. At the same time, a study of rheological characterization of the commercial inks, contained in original ink jet cartridges, was carried out for the development and deposition of a ceramic suspension, which contains the precursors of the desired material for the formation of the thin layer. Finally, some depositions of SOFC electrolytes were performed, and after the densification step, the cells were characterized by the impedance spectroscopy and also scanning electron microscopy. It was observed the formation of a dense and uniform layer, with thickness of the order of 10 μm.

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  • IPEN-DOC 24612

    UMBEHAUN, P.E. ; TORRES, W.M. . Thermal-hydraulic analysis of the IEA-R1 research reactor – a comparison between ideal and actual conditions. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 88-88.

    Abstract: Thermal-hydraulic analysis were performed for the IEA-R1 research reactor considering ideal, estimated and actual flow rate conditions through the fuel elements. The ideal conditions were obtained dividing the total primary flow rate among the fuel elements and the estimated conditions were calculated using the computer program FLOW. The actual flow rate conditions were experimentally measured using an instrumented dummy fuel element. The results show that the actual conditions are far from ideal and calculated ones due to the high bypass flow that deviates the active reactor core through the irradiation devices, gaps, couplings, etc..Thus, the safety margins are smaller for the actual flow conditions.

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  • IPEN-DOC 24832

    JARA, FERNANDO G.B. ; CRUZ, PEDRO V.D.; GALDINO, GABRIEL S.; CASINI, JULIO C.S.; SAKATA, SOLANGE K. ; FARIA JUNIOR, RUBENS N. . Thermal reduction of graphene oxide nanocomposite using a low temperature HDDR process for supercapacitors. In: PAN AMERICAN CONGRESS OF NANOTECHNOLOGY, 1st, 27-30 de novembro, 2017, Guarujá, SP. Abstract... 2017.

    Abstract: Recently, it has shown that the hydrogenation disproportionation desorption and recombination (HDDR) process can be an efficient method for the production of reduced graphene oxide for supercapacitors electrodes. The HDDR reduced graphene oxide was processed using a standard temperature (850 o C) for other materials applications. Some improvement in the specific capacitance and in the equivalent serial resistance has been obtained with this particular hydrogen thermal reduction process. The HDDR process has been considered a promising alternative method of reducing graphene oxide with efficiency and possibly in large scale production. A low temperature HDDR process was unreported for this purpose. In the present work, attempts of reducing a graphene oxide powder using a low temperature hydrogenation disproportionation desorption and recombination process (L-HDDR) has been carried out. A lower processing temperature in large scale production is significant as far as costs are concerned. Graphite oxide was prepared using a modified Hummers’ method and dispersed in ethanol, exfoliated using ultrasonication to produce Graphene Oxide (GO). Investigations have been carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The experimental results of L-HDDR processing graphene oxide powder using unmixed hydrogen at 400°C and relatively low pressures (<2 bars) have been reported.

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  • IPEN-DOC 24596

    SARKIS, J.E.S. ; PESTANA, R.C.B. ; MARIN, R.C. ; CARVALHO, E.F.U. . The use of SEM-EDX for the identification of uranium compounds in swipe samples for nuclear safeguards. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 73-73.

    Abstract: Environmental swipe sampling for safeguards purposes has been used by International Atomic Energy Agency since 1996 and is a powerful tool to detect undeclared materials and activities in States under safeguards agreements. The Secondary Electron Microscope with Energy-Dispersive X-Ray analyzing system (SEM-EDX) can be particularly useful in the initial identification of uranium in swipe samples and might be appropriate to identify and characterize uranium particles This work describes the use of SEM-EDX, as an initial screening technique, in real-life swipe samples for identifying and characterizing uranium particles. The swipe samples were collected in a conversion plant at the Nuclear and Energy Research Institute – IPEN/CNEN, São Paulo, Brazil

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  • IPEN-DOC 24598

    SARKIS, J.E.S. ; BORDON, I.C.A.C. ; PESTANA, R.C.B. . The use of nuclear forensic library in order to identify unknown seized nuclear material. Brazilian’s participation in the galaxy serpent exercise. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 74-74.

    Abstract: Nuclear fission is governed by very well known physical laws which, under certain circumstances, for instance: type of reactor, fuel and irradiation history, allow to preview with high degree of confidence, the production of energy, the build up of fission products and the transmutation of heavy metals. All these information, gathered in a nuclear forensic library (NFL), can be an important tool during the identification of a seized unknown sample, allowing to produce evidences concerning it’s irradiation history, the type of reactor or even the origin of the sample. The usefulness of a nuclear forensic library depending on not only the quantity or quality of the available data, as well as the capacity of the investigators to identify, correlate, and interpret the main parameters identified, or measured, in the seized sample. In this paper it will be described the strategy adopted by the Brazilian’s team during the Galaxy Serpent Exercise, coordinated by the Nuclear Forensics International Technical Working Group on nuclear forensics, where a NFL was used to identify an unknown sample. Our experience demonstrated the importance of the knowledge on nuclear reactions to select the main parameters to be considered during the evaluation. Then, the importance to use of simple isotopic correlations, to verify the consistency of the available information, before to use a more complex multivariate statistical techniques . Based on our investigation, the following questions were answered: Does Clio reactor belong to the NFL? Is it possible to identify which class of reactor belongs Clio? For the first question the answer is: Conclusive negative. For the second question the answer is: suggestive positive to be a BWR reactor.

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  • IPEN-DOC 24589

    SARKIS, J.E.S. ; MARIN, R.C. ; PESTANA, R.C.B. . The use of laser ablation sector field inductively coupled plasma mass spectrometry for swipe samples analysis: a viewpoint from safeguard and nuclear forensics. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 68-68.

    Abstract: This work describes the utilization of laser ablation sector field inductively coupled plasma mass spectrometry (LA-SF-ICP-MS) for determining uranium isotopic composition in a simulated swipe sample by deposition of U3O8 powder with natural enrichment level. This method is useful to measure 234U/238U and 235U/238U isotopic ratios. The measurements were performed on a continuous ablation with low energy density and defocusing, which improved the signal stability, in a cluster of uranium particles. Optimization of measurements was achieved by adjusting the following parameters: RF power, laser beam diameter, defocusing of laser beam, laser energy, laser energy-density, auxiliary gas and sample gas. The 235U/238U isotope ratio was 0.00719 0.00020 and its precision was 1.2 % RSD (relative standard deviation). Uncertainties were estimated following the International Organization for Standardization – Guide to the Expression of Uncertainty in Measurement (ISO – GUM), with a confidence level of 95.45% (k = 2.00). The results indicate that the Laser Ablation ICP-MS technique offers a rapid and accurate alternative for the measurement of uranium isotope ratios in uranium particle. The technique has the added advantage of allowing measurements straight on the sample (without further preparation), preserving the testimony which is very important for safeguards and nuclear forensics purposes.

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  • IPEN-DOC 24595

    SARKIS, J.E.S. ; PESTANA, R.C.B. ; MARIN, R.C. ; ABREU-JUNIOR, C.H.; CARVALHO, E.F.U. . The use of ICP-MS and LA-ICP-MS techniques for uranium analysis in real-life swipe samples for safeguards purposes. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 72-72.

    Abstract: Environmental swipe sampling is a powerful tool to detect undeclared materials and activities in States under safeguards agreements and has been used by the International Atomic Energy Agency since 1996. This work describes the utilization of the inductively coupled plasma mass spectrometry (ICP-MS) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) for determining uranium isotopic ratios in a real-life swipe samples collected in a conversion plant at IPEN/CNEN, Brazil. Uncertainties were estimated by following the International Organization for Standardization –Guide to the Expression of Uncertainties in Measurement (ISO GUM), with a confidence level of 95%.

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  • IPEN-DOC 24590

    SARKIS, J.E.S. ; BUCHMAN, J.H. . The use of environmental monitoring as a technique to identify isotopic enrichment activities. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 69-69.

    Abstract: The use of environmental monitoring as a technique to identify activities related to the nuclear fuel cycle has been proposed, by international organizations, as an additional measure to the safeguards agreements in force. The elements specific for each kind of nuclear activity, or "nuclear signatures", inserted in the ecosystem by several transfer paths, can be intercepted with better or worse ability by different live organisms. Depending on the kind of signature of interest, the anthropogenic material identification and quantification require the choice of adequate biologic indicators and, mainly, the use of sophisticated techniques associated with elaborate sample treatments. This work demonstrates the technical viability of using pine needles as bioindicators of nuclear signatures associated with uranium enrichment activities. Additionally, it proposes the use of a technique widely diffused nowadays in the scientific community, the High Resolution Inductively Coupled Plasma Mass Spectrometer (HR-ICP-MS), to identify the signature corresponding to that kind of activities in the ecosystem. It can be also found a description of a methodology recently being applied in analytical chemistry, based on uncertainties estimates metrological concepts, used to calculate the uncertainties associated with the obtained measurement results. Nitric acid solutions with a concentration of 0.3 mol kg􀀀1, used to wash pine needles sampled near facilities that manipulate enriched uranium and containing only 0.1 g kg􀀀1 of uranium, exhibit a 235U:238U isotopic abundance ratio of 0.0092 ? 0.0002, while solutions originated from samples collected at places located more than 200 km far from activities related to the nuclear fuel cycle exhibit a value of 0.0074 ? 0.0002 for this abundance ratio. Similar results were obtained for sample solutions prepared by microwave assisted acid digestion and dry ashing process. The different values of 235U:238U isotopic abundance ratio obtained for samples collected in different places permit to confirm the presence of anthropogenic uranium and demonstrate the viability of using this technique and the methodology proposed in this work.

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  • IPEN-DOC 24580

    ZAMPIERI, M.C.T. ; SARKIS, J.E.S. . The use of Eisenia fetida as bioindicator of nuclear activities. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 60-60.

    Abstract: Environmental sampling is one of the most important measures to strengthen the nuclear safeguard system. The collection of environmental samples, in context of the safeguard, aims to reveal information on treated materials and declared or even undeclared activities, as well. Usually two steps are involved, the first to establish the environmental fingerprint of the installation under observation, the second is to obtain compared these values with the environmental signatures. This strategy can also be used in nuclear forensic investigations. Samplings can be performed inside, outside or even near the facility under investigation, on surfaces, air, water, sediments, vegetation, soil and the local biota. In soil the earthworm is part of the biota, assimilating the metallic components during feeding or by skin absorption. The Eisenia fetida earthworm belongs to the Annelida Phylum, Oligochaete Class, the species known as California redworm, in Brazil, is widely used for the production of humus, since it has great ability to convert little decomposed organic residues into stabilized material. In the literature it has been already reported the ability of E. fetida to bioacumulate several metals including uranium and other radionuclides. In this project we are studying the ability of E. fetida to identify nuclear signatures and its ability to be used as biomonitor in nuclear safeguards and nuclear forensic investigations.

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  • IPEN-DOC 24851

    SOBRINHO, LUIZA F. ; GOTO, PAULA T. ; GARCIA, RAFAEL H.L. ; FRANCISCO, DANIEL; ANGNES, LUCIO; SAKATA, SOLANGE K. . The study of chemical and physical properties of Polyaniline-Graphene Oxide and Palladium Polyaniline-Graphene Oxide composites. In: PAN AMERICAN CONGRESS OF NANOTECHNOLOGY, 1st, 27-30 de novembro, 2017, Guarujá, SP. Abstract... 2017.

    Abstract: A Polyaniline (PANI)-Graphene Oxide (GO) composite was studied for the electrical activities. The GO was obtained by modified Hummers method. For the palladium nanoparticles (Pd-NPs) incorporation, it was established an environmentally friendly approach based on electron beam reduction. The chemical characterization was performed by Fourier Transform Infrared (FTIR) spectroscopy, Thermogravimetry (TG), X-ray Diffraction (XRD) and for the electrical properties Cyclic Voltammetry (CV) in alkaline medium and conductivity measurements. The FTIR spectroscopy and TG were used to obtain the composition of the synthesized materials, while XRD pattern indicated polymerization quality and the crystallization degree of the samples. The CV and conductivity measurements indicated the electrical activity of the composite. The results showed the GO amount was directly proportional to the resistivity of PANI, and when the Pd (Pd-Pani-GO) was present, the CV showed a larger current than the Pd-GO. The high electrochemical performance of the Pani-GO electrode could be due the increasing active sites for the deposition of polyaniline provided by large surface areas of graphene oxide sheets and the synergistic effect between polyaniline and GO. These results demonstrated the importance and great potential of graphene oxide in the development of high-performance conductivity system based on polyaniline.

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  • IPEN-DOC 24522

    CARVALHO, R.N. . The stories of Goiânia. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 03-03.

    Abstract: In the beginning of this year, I had to report the events related to the accident with 137Cs in Goiânia under a personal stance, what led me to a process of catharsis. After participating in such a significant event, and today, after reviewing historical events by means of published papers and newspaper reports, it is notorious the difference between the chaos that I experienced there and the order and clarity of the facts that I perceive today. As in the phrase attributed to Heraclitus, "No man ever steps in the same river twice, for it is not the same river and he is not the same man", during the three months while I worked as a radioprotection technician, I plunged into a sea of emotions, closely accompanying the evolution of the health of some radiation victims, and working in the decontamination and demolition of their houses. The unknowns, the dedication of some professionals and the disdain of others, along with the unusual facts that the response team and the patients were facing, gave me a sad and hilarious tone that served as a backdrop to the official history of the accident of Goiânia.

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A pesquisa no RD utiliza os recursos de busca da maioria das bases de dados. No entanto algumas dicas podem auxiliar para obter um resultado mais pertinente.

✔ É possível efetuar a busca de um autor ou um termo em todo o RD, por meio do Buscar no Repositório , isto é, o termo solicitado será localizado em qualquer campo do RD. No entanto esse tipo de pesquisa não é recomendada a não ser que se deseje um resultado amplo e generalizado.

✔ A pesquisa apresentará melhor resultado selecionando um dos filtros disponíveis em Navegar

✔ Os filtros disponíveis em Navegar tais como: Coleções, Ano de publicação, Títulos, Assuntos, Autores, Revista, Tipo de publicação são autoexplicativos. O filtro, Autores IPEN apresenta uma relação com os autores vinculados ao IPEN; o ID Autor IPEN diz respeito ao número único de identificação de cada autor constante no RD e sob o qual estão agrupados todos os seus trabalhos independente das variáveis do seu nome; Tipo de acesso diz respeito à acessibilidade do documento, isto é , sujeito as leis de direitos autorais, ID RT apresenta a relação dos relatórios técnicos, restritos para consulta das comunidades indicadas.

A opção Busca avançada utiliza os conectores da lógica boleana, é o melhor recurso para combinar chaves de busca e obter documentos relevantes à sua pesquisa, utilize os filtros apresentados na caixa de seleção para refinar o resultado de busca. Pode-se adicionar vários filtros a uma mesma busca.

Exemplo:

Buscar os artigos apresentados em um evento internacional de 2015, sobre loss of coolant, do autor Maprelian.

Autor: Maprelian

Título: loss of coolant

Tipo de publicação: Texto completo de evento

Ano de publicação: 2015

✔ Para indexação dos documentos é utilizado o Thesaurus do INIS, especializado na área nuclear e utilizado em todos os países membros da International Atomic Energy Agency – IAEA , por esse motivo, utilize os termos de busca de assunto em inglês; isto não exclui a busca livre por palavras, apenas o resultado pode não ser tão relevante ou pertinente.

✔ 95% do RD apresenta o texto completo do documento com livre acesso, para aqueles que apresentam o significa que e o documento está sujeito as leis de direitos autorais, solicita-se nesses casos contatar a Biblioteca do IPEN, bibl@ipen.br .

✔ Ao efetuar a busca por um autor o RD apresentará uma relação de todos os trabalhos depositados no RD. No lado direito da tela são apresentados os coautores com o número de trabalhos produzidos em conjunto bem como os assuntos abordados e os respectivos anos de publicação agrupados.

✔ O RD disponibiliza um quadro estatístico de produtividade, onde é possível visualizar o número dos trabalhos agrupados por tipo de coleção, a medida que estão sendo depositados no RD.

✔ Na página inicial nas referências são sinalizados todos os autores IPEN, ao clicar nesse símbolo será aberta uma nova página correspondente à aquele autor – trata-se da página do pesquisador.

✔ Na página do pesquisador, é possível verificar, as variações do nome, a relação de todos os trabalhos com texto completo bem como um quadro resumo numérico; há links para o Currículo Lattes e o Google Acadêmico ( quando esse for informado).

ATENÇÃO!

ESTE TEXTO "AJUDA" ESTÁ SUJEITO A ATUALIZAÇÕES CONSTANTES, A MEDIDA QUE NOVAS FUNCIONALIDADES E RECURSOS DE BUSCA FOREM SENDO DESENVOLVIDOS PELAS EQUIPES DA BIBLIOTECA E DA INFORMÁTICA.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

1. Portaria IPEN-CNEN/SP nº 387, que estabeleceu os princípios que nortearam a criação do RDI, clique aqui.


2. A experiência do Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) na criação de um Repositório Digital Institucional – RDI, clique aqui.

O Repositório Digital do IPEN é um equipamento institucional de acesso aberto, criado com o objetivo de reunir, preservar, disponibilizar e conferir maior visibilidade à Produção Científica publicada pelo Instituto, desde sua criação em 1956.

Operando, inicialmente como uma base de dados referencial o Repositório foi disponibilizado na atual plataforma, em junho de 2015. No Repositório está disponível o acesso ao conteúdo digital de artigos de periódicos, eventos, nacionais e internacionais, livros, capítulos, dissertações, teses e relatórios técnicos.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.