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Dejanira da Costa Lauria

Dejanira da Costa Lauria
Instituto de Radioproteção e Dosimetria, Rio de Janeiro, Brazil · Environmental Radiation Protection

PhD

About

63
Publications
9,525
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975
Citations
Citations since 2016
16 Research Items
504 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
Additional affiliations
November 2011 - December 2015

Publications

Publications (63)
Article
A large-scale survey of natural radionuclides in the soils is presented. 105 topsoil samples were collected and analysed by gamma spectrometry. The data indicated that climatic conditions might impact the content of natural radionuclides. Low-humidity conditions and igneous bedrock were associated with the highest median value of 40K in the Agreste...
Article
Soils consist of the result of several formation factors, such as the material of origin, climate, relief, living organisms etc. The natural radioactive elements ⁴⁰K, ²²⁶Ra and ²²⁸Ra are present in the mineral material as well as in the organic matters, which make up the soil and account for approximately 86% of the dose of radioactivity in humans....
Article
Soils exhibit a wide range of radioactive elements and, therefore, the knowledge of the radioactivity levels that the human being is exposed to is of great importance for Radiological Protection. This study aims to determine the activity concentrations of ⁴⁰K, ²²⁶Ra, and ²²⁸Ra in soils of Brazilian state of Espírito Santo, to produce radionuclide c...
Article
Full-text available
ABSTRACT A first large-scale systematic survey of natural radioactivity contents of soils of the state of Rio de Janeiro is presented, focused on the establishment of Quality Reference Values (QRVs). Undisturbed soil samples were collected from 243 areas and analyzed by gamma spectrometry. The activity contents varied largely, ranging from 12.2 to...
Article
Located in the south-western part of Brazil, the state of Rio de Janeiro is geotectonically contained within a complex structural province that resulted in the amalgamation of the Western Gondwana Paleocontinent. To undertake an extensive radiological characterization of this complex geological province and investigate the influence of bedrock, soi...
Article
Full-text available
As a result of discharging of liquid effluents of the Angra dos Reis power plants, 137Cs and 60Co radionuclides are the greatest contributors to increasing of radioactivity level in the sediments of the Saco de Piraquara de Fora (SPF) inlet. The thermodynamic and kinetic of sorption of the two radionuclides in sediments of the impact area from the...
Technical Report
Full-text available
Nuclear installations are designed, built, licensed and operated in order to prevent releases of radioactive materials to the environment. However, minor amounts of radioactive waste can be found in some of the gaseous or liquid effluents resulting from the normal operations and, according to International Basic Safety Standards (BSS) [1], there is...
Chapter
The pursuit for humanity’s welfare has led to the increase of industrial production for materials that bring comfort which generates waste that jeopardizes the quest for well-being. Phosphogypsum is the by-product of the phosphate fertilizer industry and is one of the biggest wastes generated by human activity. The large amount of phosphogypsum gen...
Article
Full-text available
The distribution of fallout ¹³⁷Cs in soil samples of the Rio de Janeiro State was investigated. Two-hundred sixty-two samples of soil were analyzed for ¹³⁷Cs by gamma spectrometry. A reference data set was built containing thirty-six detected values (14%) and two hundred twenty-six (86%) multiple detection limits of non-detected observations. Distr...
Article
A radioactivity survey was conducted on some of the most alkaline volcanic islands in the world. Seventy soil samples were analysed using gamma spectrometry. 226Ra, 232Th, 40K and 137Cs (Bq kg−1) activity concentration varied from 4.6 to 550, 10 to 298, 13 to 1280 and <0.3 to 2.0, respectively. Although the concentration ranges for 232Th (228Ra) an...
Article
The main pathways to human exposure associated with naturally occurring radionuclides in ornamental rocks are external irradiation and the inhalation of radon. Usually, external doses and risks are assessed by using generic approaches in which the specific properties and use of the material are not considered. Moreover, limited information on radon...
Article
The distribution of natural radionuclides (226)Ra, (228)Ra, (40)K and man-made radionuclides ((54)Mn, (60)Co and (137) Cs) in the surface sediments of an inlet of Ribeira Bay were investigated. Sediment samples were collected and analyzed for radionuclides, organic matter, carbonate, sulfate, cationic exchange capacity and grain size composition. T...
Article
Full-text available
Phosphogypsum is a by-product from the phosphate fertilizer industry, disposed in huge stacks in open-air storage areas. Its use in agriculture may be a solution to decrease these stacks, because, among its other uses, phosphogypsum can be used as a soil amendment to provide calcium and sulphur for major crops. However, it contains rare earth eleme...
Technical Report
Full-text available
Localizado na Enseada de Itaorna, Angra dos Reis, Rio de Janeiro, o Complexo Nuclear Almirante Álvaro Alberto (CNAAA) compreende duas unidades operacionais (ANGRA I e ANGRA II), além de outra projetada e em processo de licenciamento ambiental e aprovação para construção (ANGRA III). Todas as unidades dispõem de plantas de resfriamento constituídas...
Conference Paper
Full-text available
Among the radionuclides released with the liquid effluents from PWR power plants, cobalt isotopes (60 Co and 58 Co) play an important role for risk and environmental impact assessments. The laboratory experiments on radionuclide adsorption-desorption, followed by the use of adsorption isotherms are useful tools for prediction of transport, distribu...
Conference Paper
Full-text available
Resumo: A determinação dos valores do coeficiente de distribuição do sedimento de interesse pode ser influenciada pelas incertezas associadas às medições envolvidas nas diversas etapas do experimento. Assim sendo, torna-se importante a avaliação estatística dos dados obtidos nas medições de massa a fim de se conhecer as incertezas presentes no sist...
Conference Paper
Full-text available
MODARIA (Modelling and Data for Radiological Impact Assessments) project was launched in 2012 with the aim of improving the capabilities in radiation dose assessment by means of acquisition of improved data for model testing, model testing and comparison, reaching consensus on modelling philosophies, approaches and parameter values, development of...
Article
In the semiarid region of Brazil, a facility for the production of phosphoric acid for fertilizer is in the last stages of the planning phase. The raw feedstock of Santa Quiteria has a very high level of uranium associated with the phosphate in form of apatite. The reaction by which phosphoric acid is produced generates phosphogypsum (PG) as a by-p...
Conference Paper
Full-text available
A georeferenced information system of radioactivity in environmental samples, named GEORAD, was created with the goal of aggregating, storing and promoting the preservation of the data produced by Brazilian researches, and sharing with the research community a database on radioactivity in Brazil. The system provides information on concentrations of...
Article
Full-text available
This research aims to characterize the content of natural occurring radionuclides in phosphogypsum stacks at Imbituba, Santa Catarina state, Brazil. (226)Ra, (228)Ra, (40)K, (238)U and (232)Th were determined in PG, soils and sediment samples by gamma spectrometry using the hyper pure germanium detector and neutron activation. The migration of radi...
Article
This study aimed to chemically and radiologically characterize the water resources influenced by a phosphogypsum stack in Imbituba, SC, Brazil and to identify the annual intake by ingestion. Surface water was collected at six points downstream of the phosphogypsum stack. Subsurface water samples were collected from a piezometer in the stack area. T...
Conference Paper
Full-text available
An information system of radioactivity in the environment was created with the goal of aggregating, storing and preserving safely and permanently the data produced by Brazilian researches and provide the research community access to a database on radioactivity in Brazil. The system provides information on radionuclide concentrations of the natural...
Conference Paper
Full-text available
RESUMO O impacto radiológico ambiental decorrente da operação de usinas nucleares se traduz na dose de radiação recebida pelos humanos e pela biota não humana, devido à liberação de efluentes contendo materiais radioativos-em sua maioria isótopos radioativos de metais-para o meio ambiente. Ao ser lançado continuamente no Saco de Piraquara de Fora,...
Article
Terrorist attacks using radiological dispersal devices (RDD) are important threats that can lead to major environmental, economic and public health concerns. In a simulation using a Gaussian model we sought to determine dose curves as a function of distance from the explosion core site and from these data to determine the relative risk of developin...
Article
This paper focuses on a survey of uranium and thorium decay chain radionuclides in food and drinking water from the thorium-rich (monazite-bearing) region of Buena, which is located in the state of Rio de Janeiro, Brazil. The radionuclide concentration values in the food and drinking water from Buena reached values higher than 100-fold the internat...
Conference Paper
Full-text available
Working group II of the IAEA programme EMRAS II focuses on the issue of "NORM and legacy sites". An overview of the objectives and achievements of the working group-composed of both modellers and regulators-is given. e group performed a review of several NORM and legacy sites from 16 countries and developed a General Assessment Methodology. Two sit...
Article
Full-text available
In January 2009, the IAEA EMRAS II (Environmental Modelling for Radiation Safety II) program was launched. The goal of the program is to develop, compare and test models for the assessment of radiological impacts to the public and the environment due to radionuclides being released or already existing in the environment; to help countries build and...
Conference Paper
Full-text available
1. Background for forming the group Many sites around the world are contaminated by man-made radionuclides or materials containing naturally occurring radionuclides (NORM). Sites that have not been operated with adequate controls according to present standards may pose a hazard to humans and the environment. Many sites fall within the definition in...
Article
Full-text available
Uranium mining and milling activities started operations in Brazil during the 80´s. The first production Center was deployed in Poços de Caldas (CIPC) State of Minas Gerais. The mine was exhausted in 1997, after has produced only 1200 t of U 3 O 8 . The second uranium plant began the operations in Caetité (URA), Bahia State, since 1999 and keeps op...
Article
Vegetables grown with phosphate fertilizer (conventional management), with bovine manure fertilization (organic management) and in a mineral nutrient solution (hydroponic) were analyzed and the concentrations of (238)U, (226)Ra and (228)Ra in lettuce, carrots, and beans were compared. Lettuce from hydroponic farming system showed the lowest concent...
Article
Full-text available
The uranium mining site of Poços de Caldas consists of open mine pit, tailings, waste rock dumps and an acid rock drainage problem, which has the potential to impact upon freshwater of the Ribeirão das Antas catchment. The high level of manganese (value of 1.8 mg/L) contained in the discharge water (DW) is an important factor affecting the water qu...
Article
The existence of a traceable relationship between national regulatory standards and international recommendations is important especially when the national regulations have to be justified and explained to the public and their representatives. Guidance on various types of radiological levels in environmental media related to public exposure has bee...
Article
The objective of the Environmental Radiological Monitoring Control programme carried out by the Institute of Radiation Protection and Dosimetry (IRD) in Brazil is to verify the licensee's compliance with the requirements for environmental monitoring of Brazilian facilities. The Joint Sampling Programme (JSP) is just one part of the control programm...
Article
The environmental program for the Botuxim repository, designed for the disposal of a thorium concentrate (Cake II) originating from the processing of monazite sands has posed some challenges through the years. One of these challenges relates to a supposed contamination of groundwater well inside the repository site. As the repository was built befo...
Article
Full-text available
The exploitation of natural resources containing naturally occurring radionuclides may lead to enhanced levels of radioactive isotope and enhanced potential for exposure to naturally occurring radionuclides in products, by-products, residues or wastes. Such resources include, for instance, monazite, the processing of which, in Brazil, generated a g...
Article
Ground water from Região dos Lagos, a coastal area of Rio de Janeiro state, was analysed for (226)Ra, (228)Ra, (222)Rn, (238)U, major ion concentrations, and physico-chemical parameters were also measured. Concentrations values ranged from <0.002 to 0.492 Bq l(-1) for (226)Ra, from <0.01 to 1.50 Bq l(-1) for (228)Ra and from < 1.0 x 10(-4) to 8.0 x...
Article
Full-text available
Groundwater found near the head of the Buena Lagoon in the State of Rio de Janeiro, Brazil, has high salinity and low pH values. There is a strong correlation between concentrations of radium and light rare earth elements (LREEs) that suggests the leaching of monazite as a common source. Radium is present predominantly as 228Ra. The factors respons...
Article
Full-text available
Concentrations of Al, Cd, Cr, Cu, Mn, Ni, Pb, U and Zn were determined in vegetables (leafy vegetables, fruit, root, grain and cereal), derived products (sugar, coffee, manioc flour, wheat flour, corn flour, and pasta) and animal products (meat, fish, milk) most frequently consumed by adult inhabitants of Rio de Janeiro city. A total of 90 samples...
Article
Full-text available
The concentrations of the naturally occurring radionuclides 232Th, 238U, 210Pb, 226Ra and 238Ra were determined in the vegetables (leafy vegetables, fruit, root, bean and rice) and derived products (sugar, coffee, manioc flour, wheat flour, corn flour and pasta) consumed most by the adult inhabitants of Rio de Janeiro City. A total of 88 samples fr...
Article
Unexpected high 228Ra concentrations, up to 2 Bq 1(-1), were found in waters of a coastal lagoon close to a monazite sand separation plant. Due to their use as process waters in this plant, the initial supposition was a contamination related to its operation. However, it was concluded that these abnormal radium concentrations had a natural origin,...
Article
Full-text available
The radium accumulation and libération in Thypha dominguenes Pers. green leaves and leaf détritus from a coastal lagoon was stud¬ ied by in situ and lab experiments. From results of leaf sample anal¬ ysis collected in différent locals of the lagoon and the lab experiments, adsorption experiments followed by sequential extrac¬ tion, it was observed...
Article
Full-text available
É investigada a origem e discutido o comportamento dos isótopos radioativos de rádio, Ra-228 e Ra-226, em águas subterrâneas da região de Buena, no norte do estado do Rio de Janeiro. Com o objetivo de identificar a origem das elevadas concentrações foram analisadas águas dos afloramentos e de poços circunvizinhos aos afloramentos. Métodos radioquím...
Article
Full-text available
Little is known about the amount of water and ash in brazilian foodstuffs and plants. The relationships between fresh, dry and ash weight were determined in 40 different biological samples. It could be an important tool when one studies biological material containing low concentration of the chemical elements. This study address to determine these...
Article
Full-text available
Following the definition from the International Atomic Energy Agency, a so-called hour method is that which needs six hours time interval from the sample solution preparation to the data evaluation. Two alternative procedures to be applied to soil samples were studied. One based on LaF3 precipitation and ion-exchange and another on extraction chrom...
Article
The radiological accident that occurred in Goiania City, Brazil, in September 1987, led to the spreading of137Cs in the urban area. Even after the decontamination procedure, there was a reminiscence of137Cs activity in the soil of residential gardens. This activity was enough to conduct preliminary experiments for determination of soil to vegetable...
Article
Full-text available
A sequential analytical method for the determination of238U,234U,232Th,230Th,228Th,228Ra,226Ra and210Pb in environmental samples was developed. Uranium and thorium isotopes are first chromatographically sepaaated using tri-n-octyl phosphine oxide (TOPO) supported on silica gel. The uranium isotopes are determined by alpha-spectrometry following ext...
Article
A sequential analytical method for the determination of 238U, 234U, 234Th, 230Th, 228Th, 228Ra and 226Ra in environmental samples has been developed. Uranium and thorium isotopes are initially separated using tri-n-octyl phosphine oxide (TOPO) supported on a column of silica gel. The uranium isotopes are determined by alpha-spectrometry following e...
Article
We describe a new method of preparing thin sources for the determination of uranium isotopes by alpha-spectrometry. The sources are produced by extracting the uranium isotopes from 1 M HNO3-4M Al(NO3)3 aqueous solution with polymeric membranes containing trioctylphosphine oxide (TOPO). We demonstrated that the sources are comparable to those obtain...
Article
Full-text available
Liquid scintillation counting (LSC), gamma spectrometry, and total beta counting are methods for determining 210Pb concentration in environmental samples. In this research, we investigated a fast, simple method to determine 210Pb by LSC in environmental samples; the method is capable of estimating concentrations higher than 20 mBq/L for liquid samp...
Article
Available in abstract form only. Full text of publication follows: Decommissioning and remediation activities are subject to some common driving forces that influence the ability of decommissioning and remediation programs to achieve end-states that correspond to planned or anticipated (future) end-uses (i.e., facility or site re-use). In addition,...
Article
Full-text available
Vulnerability assessment to delineate areas that are more susceptible to contamination from anthropogenic sources has become an important element for sensible resource management and land use planning. This paper address a groundwater survey in an area where intensive agricultural activity takes place with the aim of evaluating factors affecting gr...
Article
It is common to find higher concentration of 228 Ra in water and foodstuff than that of 226 Ra. Considering that the current value of the ingestion dose conversion factor of 228 Ra is about 2 times higher than the 226 Ra one, the lack of information of 228 Ra in literature is difficult to explain. A higher priority on obtaining environmental data o...

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Projects (4)
Archived project
Este projeto propõe um mapeamento do sedimento de fundo do saco de Piraquara de Fora quanto às suas características físicas e químicas, e, se possível, às distribuições de concentrações dos principais radionuclídeos liberados pelos reatores nucleares Angra I e Angra II. Com esta finalidade, a distribuição granulométrica e algumas características químicas dos sedimentos serão estudadas, assim como a dinâmica de adsorção dos principais radionuclídeos liberados pelas usinas como Co-60, Mn-54 e Cs-137. A determinação do coeficiente de distribuição (Kd) para estes radionuclídeos nos diferentes tipos de sedimento encontrados, auxiliará no entendimento dos processos ambientais e na elaboração de um prognóstico do comportamento futuro dos diferentes radionuclídeos no sedimento de fundo com a continuidade da liberação dos efluentes líquidos e com a entrada em funcionamento de Angra III. Estes dados serão utilizados para a avaliação da dose na biota e no homem, devido às descargas de efluentes líquidos. Este estudo subsidiará uma avaliação do programa de monitoração ambiental do CNAAA e uma nova proposta e metodologia de trabalho poderá ser elaborada.