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\n 15_P-XRF<\/b> \/ AVALIAÇÃO DA METODOLOGIA DE MEDIDAS DE ESPESSURA DE CAMADAS UTILIZANDO FLUORESCÊNCIA DE RAIOS X\n <\/div>\n
\n Francis Anna Cardoso Reis de Almeida Sanches\n <\/div>\n <\/div>\n
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\n A técnica de fluorescência de raios X por dispersão em energia (EDXRF) é amplamente empregada em análises de obras de artes e em objetos de patrimônio histórico por ser uma técnica não invasiva, capaz de fornecer informações sobre a composição química e a concentração dos elementos. Muitos objetos de valor arqueológico são compostos por uma estrutura de duas ou mais camadas de diferentes materiais, sendo uma de substrato e uma ou mais camadas de revestimento. A técnica de EDXRF tem sido avaliada como uma possível ferramenta para determinar a espessura de duas e\/ou várias camadas de materiais, podendo auxiliar na conservação e restauração de objetos do patrimônio cultural [1]. O objetivo desse trabalho consiste na avaliação da metodologia de medida de espessura de camadas depositadas sobre uma base usando a razão entre as linhas de fluorescência de raios X (Kα\/Kβ ou Lα\/Lβ) emitidas por elementos da base. As análises das espessuras foram realizadas em folhas de alumínio de diferentes espessuras (12 μm, 36 μm e 60 μm) depositadas em dois materiais de base: cobre e chumbo. O sistema de XRF utilizado para as medidas de espessura é formado por um mini tubo de raios X de baixa potência com anodo de Ag e um detector SiPIN. Variando a posição do tubo de raios X e do detector foram avaliadas três configurações do sistema de XRF para o cálculo da espessura: tubo de raios X perpendicular a amostra, detector perpendicular a amostra e , por fim, tubo de raios X e detector simétricos a amostra. Em cada geometria variou-se o ângulo entre o feixe incidente e detector. Foi possível determinar as três espessuras das folhas de alumínio nas três geometrias analisadas, tanta na base de cobre quanto na base de chumbo. As medidas de espessura obtidas com a segunda geometria (detector perpendicular a amostra) foram as que apresentaram menores exatidões quando comparadas com o valor esperado das espessuras das folhas de alumínio. Os resultados mostraram que a primeira e a terceira geometrias foram mais eficientes para o cálculo da espessura de camadas. Além disso, os resultados demonstraram que quanto menor o ângulo entre o detector e a amostra mais preciso se torna o cálculo da espessura.\n <\/div>\n <\/div>\n<\/div>\n
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\n 23_P-XRD<\/b> \/ AVIAN NEUROLOGY ACCESS BY X-RAY MICROTOMOGRAPHY\n <\/div>\n
\n German Tirao\n <\/div>\n <\/div>\n
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\n The study in avian neurology has been largely enrichened by the use of CT scans. This methodology presents obvious advantages. Materials usually do not need treatment before entering the scanner, no deterioration occurs during the scan, and the results allow the reconstruction of high-quality 3D models, which represent an essential step in order to perform more complex anatomical and biomechanical studies. The datasets obtained by the scans are longlasting and easily portable, facilitating the comparison and study of the 3D models obtained, which are easily manipulated, sectioned and redescribed. More importantly, this methodology provides data on extant taxa characterized as ‘very rare’ or endangered, andsvn add extinct birds rare in the fossil record. In order to explore brain anatomy in several bird species, X-raysvn add micro-CT data were obtained using an experiemntal micro-CT scanner available at Facultad desvn add Matemática, Astronomía y Física (FaMAF). This equipment allows to obtain 2D and 3D images up to 20svn add cm x 20 cm with resolutions of 194 microns. It is also possible to maximize the quality of the images fromsvn add the control of main parameters involved in the image acquisition: conformation of the X-ray beam (spatialsvn add and spectral distribution), counting statistics, number of projections, relative position of the sample andsvn add detector. Different reconstruction algorithms and filtering algorithms were implemented in order to obtainsvn add highest quality 3D models. This is actually possible thanks to the interdisciplinary work of professionalssvn add from different areas of knowledge.\n <\/div>\n <\/div>\n<\/div>\n
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\n 08_P-XRD<\/b> \/ CARACTERIZACIÓN ARQUEOMÉTRICA DE CERÁMICAS Y ADOBES DEL YACIMIENTO DE CERRO CEPERO - BAZA (ESPAÑA)\n <\/div>\n
\n Gilson Fernandes Vieira\n <\/div>\n <\/div>\n
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\n Para este estudio seleccionamos muestras de cerámicas y adobes del yacimiento de Cerro Cepero localizado en la comarca de Baza, Andalucía (España). Cronológicamente su fase de ocupación abarca desde la época del Bronce Final hasta el siglo VII d.C. Esa región tuvo diversas excavaciones irregulares desde hace muchos años, por diferentes equipos de arqueólogos. Y actualmente el yacimiento es objeto de estudio del Centro de Estudios de Arqueología Bastetana. En este yacimiento fue posible recuperar materiales cerámicos de gran relevancia y estudiar adobes de estructuras ibéricas, siendo la principal de ellas la muralla que aflora en la zona norte.\r\nLa caracterización de las muestras fue hecha mediante el empleo de Difracción de Rayos X y Fluorescencia de Rayos X, teniendo otras técnicas complementarias como el estudio de Análisis de Imágenes, Análisis Petrográfica y Colorimetria. La Difracción de Rayos X fue utilizada para definir las fases mineralógicas que componen los adobes y las cerámicas, además de estimar su posible temperatura de cocción. El estudio de la composición química fue hecho mediante la Fluorescencia de Rayos X, donde se han discriminado los elementos mayoritarios y los trazas. Los datos obtenidos fueron tratados por el método de Análisis de Componentes Principales (PCA) con el fin de comparar las variables químicas.\r\n\n <\/div>\n <\/div>\n<\/div>\n
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\n 10_P-XRF<\/b> \/ CERIUM (IV) OXIDE NANOPARTICLE MOBILITY AND TRANSFORMATION IN SOILS\n <\/div>\n
\n Eduardo de Almeida\n <\/div>\n <\/div>\n
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\n Cerium oxide (CeO2) nanoparticle (NP) has unique physical and chemical properties. These particular features enable the CeO2 NP to a wide variety of recent application, such as UV absorption, catalysis, solid oxide fuel cells use, and so forth. However, the environmental risks of CeO2 NP have not been extensively studied so far and it has been a matter of currently concern worldwide. In this context, this study aims at the CeO2 NP (20 nm particle size) mobility as well as its conceivable transformation in Typic Hapludox and Rhodic Hapludox soils. For the soil CeO2 NP mobility evaluation, an acrylic column filled with the abovementioned soils top covered with 350 mg CeO2 NP was employed as shown in Figure 1. Breakthrough assays using a volume of synthetic rain water equivalent to average precipitation from Jan-Mar were carried out. The translocation of Br- and CeO2 were investigated for both soils. Benchtop energy dispersive X-ray fluorescence (EDXRF) was used to detect the presence of Br and Ce in the eluate. Br- was highly mobile whereas CeO2 did not leach. Further EDXRF analysis showed that CeO2 remained adsorbed at the first two centimetres of the soil column. Another matter of concern regards possible chemical transformations undergone by CeO2 NP in the soil. To assess CeO2 NP reactivity the NP was incubated in Typic Hapludox and Rhodic Hapludox soils aqueous suspensions for two weeks under stirring. Then, Ce-L3 X-ray absorption spectra were recorded at the XAFAS2 beamline at the Brazilian Synchrotron Light Source (LNLS). Figure 2 shows the near edged fine structure spectra for the NP incubated in Typic Hapludox and the pristine one. The preliminary results indicate that only slight changes have been observed. The whiteline increasing might be related to changes at the electronic structure of the incubated NP. Seemingly, the density of empty states increases, which could be promoted by oxygen vacancies. Anyway, for this short period, i.e. two weeks, under mild environmental conditions we have not find any dramatic changes on CeO2 chemical environment.\n <\/div>\n <\/div>\n<\/div>\n
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\n 05_P-XRD<\/b> \/ CRIAÇÃO DE SIMULADOR DE RADIOGRAFIA PARA CÁLCULO E DEMONSTRAÇÃO GRÁFICA DE EFEITOS DA RADIAÇÃO ESPALHADA\n <\/div>\n
\n Gabriel dos Santos Barbosa\n <\/div>\n <\/div>\n
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\n A radiação espalhada tende a ser uma fonte de problemas em técnicas radiológicas, tanto a para a qualidade da imagem quanto para a radioproteção. Ela pode aumentar o ruído da radiografia, prejudicando a uniformidade e o contraste da imagem, mas também pode aumentar a exposição do operador, pois torna a amostra uma fonte secundária de radiação ionizante. A consciência da existência e do comportamento da radiação espalhada é um importante fator para práticas de proteção radiológica, mas também para a otimização dos parâmetros da técnica, otimizando a imagem. Imagens computacionais representativas deste tipo de radiação são excelentes materiais para a demonstração destes. \r\nO processo de interação da radiação ionizante com a matéria, que gera radiação espalhada tem algumas similaridades com o processo de luz visível, mas não acontece apenas na superfície de um determinado corpo. O objetivo deste trabalho é criar um simulador de baixo custo computacional para cálculo e demonstração gráfica do comportamento da radiação espalhada, em função de diversos fatores como energia e intensidade do feixe, material e meio radiografado, assim como os efeitos da mesma na imagem gerada. O simulador será construído na linguagem C e na plataforma de cálculo numérico OCTAVE. Todo o processo será executado dentro do ambiente virtual que fará parte do simulador. Mantendo a possibilidade de mudança e criações de condições diferenciadas e mantendo interatividade com o usuário final. O principal produto do simulador serão imagens do ambiente virtual da radiografia, assim como das radiografias geradas. Estas imagens terão predominantemente viés educativo, mas com capacidade para simular testes reais.\n <\/div>\n <\/div>\n<\/div>\n
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\n 15_P-XRD<\/b> \/ DESENVOLVIMENTO DE FERRAMENTA COMPUTACIONAL PARA PROTOTIPAÇÃO RÁPIDA DE OSSOS MICROTOMOGRAFADOS DE PEQUENOS ANIMAIS\n <\/div>\n
\n Julio Cesar Latini Stutz\n <\/div>\n <\/div>\n
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\n O estudo dos ossos e de suas características histomorfométricas é fundamental para a correta classificação de várias espécias de animais. Estas medidas, em sua maioria, são feitas através da separação dos tecidos ósseos dos demais tecidos biológicos da amostra e posterior medição. É muito comum o uso de técnicas como a diafanização e a maceração no estudo de vertebrados. Estes processos, apesar de amplamente utilizados, são processos destrutivos que em muitos casos não pode ser aplicado devido ao tamanho reduzido dos ossos de alguns exemplares. Para contornar estas limitações o uso de técnicas de diagnósticos por imagens não destrutivas tem sido amplamente utilizado para a obtenção das informações volumétricas internas e externas dos ossos. Neste trabalho utilizamos a microtomografia computadorizada para aquisição destas informações. Agregando a este cenário uma crescente oferta de tecnologias para prototipagem rápidas a custos cada vez mais reduzidos, torna possível com auxílio de software de CAD a construção de modelos biológicos que permitem a reprodução de inúmeras réplicas da estrutura óssea. Estes modelos podem ser reproduzidos em diferentes dimensões, posições e materiais, tanto na parte externa ou interna do osso. No entanto, este é um processo complexo que exige a manipulação das imagens por diversos programas específicos até a obtenção do modelo tridimensional a ser prototipado. Os resultados obtidos em ossos de codornas (Coturnix Coturnix) e em pequenos sapos da espécie Proceratophrys bigibbosa, mostraram o grande potencial de aplicação desta ferramenta computacional na construção de biomodelos para estudos biológicos e didáticos de pequenos animais.\n <\/div>\n <\/div>\n<\/div>\n
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\n 19_P-XRF<\/b> \/ DETECÇÃO DE TEOR DE FERRO EM MEDICAMENTOS A BASE DE CELULOSE POR XRF\n <\/div>\n
\n Joaquim Teixeira de Assis\n <\/div>\n <\/div>\n
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\n O ferro é um importante elemento no transporte respiratório do oxigênio e dióxido de carbono e nas enzimas envolvidas no transporte celular. A anemia ferropriva é um problema de saúde pública no mundo que afeta cerca de dois bilhões de pessoas, especialmente nos países em desenvolvimento. No Brasil os programas de prevenção e tratamento da anemia fazem a reposição do ferro utilizando de forma padronizada o sulfato ferroso devido ao seu baixo custo aliado à sua alta biodisponibilidade. Neste estudo foram preparadas amostras com quantidades conhecidas de F2SO4 em base de celulose e construir uma curva apropriada para identificação rápida de conteúdo deste material em medicamentos adquiridos no comércio. Foram produzidas amostras e com duas granulometrias e com quantidades de F2SO4 entre 80 e 375mg por grama de celulose, de modo a observar a influência da granulometria no resultado. As amostras produzidas foram medidas num sistema de XRF da Amptek com tubo de raios X com anodo de Au (com tensão de 20keV e corrente de 20µA)e espectrômetro 123 (SDD). Os resultados mostraram que para quantidades até 300mg\/g a resposta é linear e essa técnica pode ser utilizado neste tipo de amostra. Novas medidas estão sendo feitas com base de lactose, pois são estas as bases mais utilizadas em medicamentos comerciais.\n <\/div>\n <\/div>\n<\/div>\n
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\n 09_P-XRF<\/b> \/ DEVELOPMENT OF AN INTEGRATED CONTROL SYSTEM TO MICRO X-RAY FLUORESCENCE ANALYSIS\n <\/div>\n
\n Diogo Santos Silva da Costa\n <\/div>\n <\/div>\n
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\n This project intends to develop a remote control to micro X-ray fluorescence (µXRF) system. X-ray microfluorescence represents a relatively specialized form of XRF analysis, it is becoming increasingly adopted in specialized applications because of its unique analytical capabilities and the complementary nature of results in comparison with other microprobe techniques. The system utilized was developed by Laboratório de Instrumentação Eletrônica e Técnicas Analíticas (LIETA) group and named Sistema Integrado de Controle (SIC). The system consists in three main integrated modules: X-ray tube, digital pulse processor and high accurate table. A microcomputer connect all the modules and process the data acquisition. This equipment has a graphic user interface by means of a website. The website control enables the final user to perform µXRF measurment by any device with web browser available. With simple steps, the automated system initiates all computacional commands of the routine and generate photon counts per channel data files. All the generated data is processed at PyMca analysis software.\n <\/div>\n <\/div>\n<\/div>\n
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\n 13_P-XRF<\/b> \/ EVALUATION OF METALS IN SOIL AND LEACHATE FROM IMPROPER DISPOSAL OF BATTERIES AND ELECTRONIC COMPONENTS IN SOIL USING SRTXRF AND EDXRF\n <\/div>\n
\n Fábio Luiz Melquaides\n <\/div>\n <\/div>\n
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\n In recent decades, it has been a large increase in the use of electronic devices as well as their batteries consumption. However, the improper disposal of these materials can cause soil and groundwater contamination by potentially toxic metals. In this context, the present study aims to evaluate the total elemental content and their leaching from soil exposed to Zn-C and alkaline batteries and electronic components from printed circuit boards. Test soil columns 40 cm in length containing the above mentioned materials were prepared. The soil columns were exposed to artificial rain and the leachate were collected. The leachate samples were analyzed by the synchrotron radiation total reflection X-Ray fluorescence spectrometry (SRTXRF) at the Brazilian Synchrotron Light Laboratory D09-XRF beam line. The Cr, Mn, Fe, Cu, Zn and Pb content in the leachate were lower than the set maximum values CONAMA 369\/2008 resolution. The SRTXRF K, Ca, Ti, Cr, Mn, Fe, Cu, Zn and Pb detection limits ranged from 0.22 μg L^(-1) to 4.32 μg L^(-1). The results showed a higher leaching of K, Mn, Zn and Pb in the columns containing batteries. For soil analysis, Al, Si, K, Ca, Ti, Cr, Mn, Fe, Cu, Zn, Zr and Pb were evaluated using a benchtop energy dispersive X-Ray fluorescence spectrometer (EDXRF) and the detection limits ranged from 5390 to 16 mg kg^(-1). For soil columns batteries containing, higher K, Mn and Zn levels were found in the surface soil layer compared to the control. For soil columns printed circuit boards containing, an increase of Ti, Mn and Pb were evident. In addition, the metal concentration variation in soil was evident only in surface soil, up to 10 cm. From 10 to 40 cm the difference soil was minimal compared to the blank. SRTXRF and EDXRF were showed promising techniques for evaluation of metals in the leachate and soil, respectively.\n <\/div>\n <\/div>\n<\/div>\n
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\n 06_P-XRD<\/b> \/ Influence of Incident Spectra and Dimensions of the Scatterer on Energy Correction Factor for the Dosimetry of Occupational Workers Who Perform Paediatric Exams\n <\/div>\n
\n Gabriela Hoff\n <\/div>\n <\/div>\n
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\n Occupational exposures are important parameters that need to be investigated to evaluate the radiological effects. On this work we used Geant4, version 9.6.p03 and low energy model Livermore, to define the energy correction factor (ECF) to be used on correction of thermoluminescent dosimeters (TLDs) measurements. The simulated TLDs were positioned over Bomb phantoms, representing occupational workers involved in fluoroscopic paediatric procedures. We calculated the ECF to X-ray scattered spectra by different paediatric phantoms (newborn, 1 year old, 5 years old and 10 years old), representing patients of different size undergoing fluoroscopic barium meal procedure at 60 kVp and 75 kVp. The TLDs were fixed over three regions of the occupational workers simulated: eyes (left and right), thyroid (over and under the collar of protection) and hands (left and right). The primary spectrum and scattered spectrum, that interact to each TLD, were recorded and used to calculate the ECF. We used a systematic analyses to observe de significance on influences and tendencies observed. As results we found that: (i) the scattered dimensions (paediatric phantoms simulated) does influence on ECF, in a way that an increase on scatterer size tends to increase the ECF to a fixed position of the TLD; (ii) the incident spectra energy (ripple and peak tension) can change the ECF significantly.\n <\/div>\n <\/div>\n<\/div>\n
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\n 07_P-XRD<\/b> \/ NEW CR1-XTIXSE SOLID SOLUTIONS WITH NIAS-TYPE STRUCTURE: X-RAY POWDER DIFFRACTION AND EMISSION SPECTROSCOPY STUDIES\n <\/div>\n
\n German Tirao\n <\/div>\n <\/div>\n
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\n The novel Cr1-xTixSe compounds have been synthesized for x = 0, 0.05, 0.10 and 0.15. Although both CrSe and TiSe are individually reported as NiAs-type phases, solid solutions in this system have not been previously synthesized. Structural characterization was made using X-Ray Powder Diffraction (XRD) data. All samples belong to the P63\/mmc space group and share the nickel arsenide (NiAs) structure type. Chromium and titanium are known to have different oxidation states in selenide compounds, both varying between +2 and +4 oxidation states. In the case of study stoichiometry suggests a +2 oxidation state for the metals. However, the NiAs structure presents a very short cation-cation distance that can lead to some degree of bonding, affecting oxidation states. X-ray Emission Spectroscopy (XES) measurements were carried out in order to study the oxidation state of chromium in these new compounds. A high-resolution Kβ spectrum of a common chromium selenide is shown in Figure 1. By calculating the difference between the Kβ5and Kβ1,3 peak positions (DE) and comparing with appropriate standards, oxidation states can be inferred for each sample. All three substituted samples contain chromium in an average +2 oxidation state within experimental error. Additional sample characterization included resistivity measurements, which will also be discussed and complemented by the conclusions of the structural characterization as a whole.\n <\/div>\n <\/div>\n<\/div>\n
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\n 23_P-XRF<\/b> \/ QUANTIFICAÇÃO DE ENXOFRE EM DIESEIS S5 E S10 CONTENDO ATÉ 10 % EM VOLUME DE BIODIESEL POR ESPECTROMETRIA DE FLUORESCÊNCIA DE RAIOS X\n <\/div>\n
\n Luiz Andre Nunes Mendes\n <\/div>\n <\/div>\n
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\n O teor de biodiesel no diesel, em volume, aumentará dos atuais 7 % até 10 % em 2019, podendo chegar a 15 % se os testes e os ensaios com motores validarem essa adição. O Programa de Monitoramento da Qualidade dos Combustíveis da ANP referencia as normas ASTM D5453, ASTM D2622, ASTM D4294, ASTM D7039 e ABNT NBR 14533 para a determinação de enxofre em diesel comercializado no Brasil que, à exceção da primeira, baseiam-se na espectrometria de fluorescência de raios X, cuja acurácia depende da correta correção do efeito matriz. Tendo isso em mente, foram estudados o efeito matriz devido à presença de biodiesel, ou seja, de oxigênio, na intensidade de emissão da radiação S-Kα de amostras de diesel contendo traços de enxofre e algoritmos de correção do efeito matriz por meio de coeficientes de influência empíricos e teóricos. A avaliação da estatística erro relativo mostrou que o algoritmo de De Jongh considerando o oxigênio foi o que melhor corrigiu o efeito do oxigênio na quantificação de enxofre em misturas de diesel S5 e S10, ambos contendo até 10 % de biodiesel em volume. \n <\/div>\n <\/div>\n<\/div>\n
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\n 16_P-XRF<\/b> \/ THICKNESS MEASUREMENT OF GOLDEN LAYERS IN BAROQUE SCULPTURE OF THE XVIII CENTURY USING X-RAYS CHARACTERISTIC PEAKS RATIO\n <\/div>\n
\n Francisco José Castro Correia Junior\n <\/div>\n <\/div>\n
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\n The materials analysis by Energy Dispersive X-ray Fluorescence (EDXRF) depends on the elementary composition and the layer thickness studied. Samples with many layers are common in historical artifacts, with pigments overlapping paintings or metal layers of recoating. In this work, the layer’s thickness measurement method using the intensity of Ka\/Kb or La\/Lb characteristic X-ray peaks was studied. Using few samples extracted from the baroque sculpture in polychrome wood from Saint João Evangelista, from XVIII century, it was measured the gold layer thickness that overlies gold details of the image. The sculpture was carved to the Jesuits Church's altar built at Castelo's Hill in 1567. After the Hill’s overthrow, in 1922, the artworks were been saved at Saint Inácio School's hall (Rio de Janeiro, Brazil). For the X-ray peaks intensity analysis, was used a portable model TRACER IV of Bruker, the spectrums were collected with operating system voltage 40kV and 10μA and 120 seconds of acquisition time. The results obtained from the technique using the X-ray peaks were compared to the results obtained using the high resolution optical microscope automated, model Axio Imager M2m from Carl Zeiss. The founded results prove the technique efficiency, it is important when are only available sample’s fragments that do not allow using optical microscope\n <\/div>\n <\/div>\n<\/div>\n
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\n 14_P-XRF<\/b> \/ USE OF PORTABLE EDXRF ASSOCIATED WITH PRINCIPAL COMPONENT ANALYSIS (PCA) FOR THE DETERMINATION OF INORGANIC ELEMENTS AND PROVENANCE OF COSMETICS\n <\/div>\n
\n Fábio Luiz Melquaides\n <\/div>\n <\/div>\n
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\n Nowadays men and women spend a lot of time, resources and efforts to the cultivation of personal hygiene and the best possible look, as a result, the cosmetics industry plays an important role in the economy of most developed countries. The raw materials used in cosmetics are classified as active principles or excipients. Excipient is all inert ingredient added to a formulation to give consistency, in order that the product can be applied, handled and packaged appropriately. The active ingredients are substances that effectively work and promote changes on the body regions in which the cosmetics are applied, e.g., skin, eyelids, nails, etc., thus their amounts need to be controlled due to the application acceptable limits, its toxicity, the consequences of excessive doses, possible side effects, and the possibility of sensitization and allergic reactions. The concentration and quality of the raw material used in the manufacture of a cosmetics product can be verified by analytical methods, among them the X-ray fluorescence, since X-ray fluorescence technique is suitable for performing multi-elemental analysis with low cost and fast results. This study, developed in Applied Nuclear Physics Laboratory (LFNA) of the Londrina State University (UEL), had as objective inorganic elements determination in cosmetic samples, as well as its matrix characterization. It was used a portable energy dispersive X-ray fluorescence (EDXRF) system associated with principal components analysis (PCA). For the measurements was used a home-made portable system which consists of a X-ray tube with Ag target and filter (MAGNUM MUHV50, Moxtek); a high voltage source (FTC-200, Moxtek) for control of the voltage and electric current applied to the X-ray tube; the X-123 complete X-ray spectrometer with Si-PIN detector (Amptek) with FWHM@5.9 keV: 153 eV; and a laptop for acquisition, storage and data treatment. A total of 40 eye shadows samples from 4 manufacturers and suppliers in the Brazilian market representing different colors and shades were analyzed. It was possible to identify and quantify the elements Cl, K, Ca, Ti, Cr, Fe, Cu, Zn and Bi. In order to verify tendencies in the classification of the samples, the set of X-ray spectra was evaluated by principal components analysis. The whole X-ray spectrum was considered in the analysis and it was possible to verify a separation of the samples in groups in accordance with manufacturer. From the multi-elemental data obtained by X-ray fluorescence and the information revealed by the principal component analysis it was possible to identify the differences in the composition of each set of samples. Based on these results it can be seen that the combination of X-ray fluorescence technique with the principal component analysis presents a valuable tool for the classification and characterization of cosmetics samples.\n <\/div>\n <\/div>\n<\/div>\n"}