Neutron Activation Analysis
Mostrando 25-36 de 90 artigos, teses e dissertações.
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25. DEVELOPMENT OF A GAMMA RAY SPECTROMETRY SOFTWARE FOR NEUTRON ACTIVATION ANALYSIS USING THE OPEN SOURCE CONCEP / Desenvolvimento de um software de espectrometria gama para análise por ativação com nêutrons utilizando o conceito de código livre
This study developed a specific software for gamma ray spectra analysis for researchers of the Neutron Activation Laboratory (LAN), which was named SAANI (Instrumental Neutron Activation Analysis Software). The LAN laboratory of the Institute for Research and Nuclear Energy (IPEN-CNEN/SP), uses a multielementar analytical technique, based on irradiation of a
Publicado em: 2008
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26. Determinação de elementos essenciais e tóxicos em cogumelos comestíveis por análise por ativação com nêutrons / ESSENTIAL AND TOXIC ELEMENT DETERMINATION IN EDIBLE MUSHROOMS BY NEUTRON ACTIVATION ANALYSIS
In this study concentrations of As, Br, Co, Cr, Cs, Fe, K, Na, Rb, Se and Zn were determined in edible mushrooms acquired from commercial establishments in the city of São Paulo and directly from Mogi das Cruzes, Suzano, Juquitiba and Mirandópolis producers. The analytical technnique used for determining these elements in edible mushrooms was Instrumental
Publicado em: 2008
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27. Desenvolvimento de espectroscopia de plasma induzido por laser para aplicações em análise de patrimônio cultural: estudo de moedas de Um Cruzeiro de 1945 e Mil Réis de 1939 / DEVELOPMENT OF LASER INDUCED BREAKDOWN SPECTROSCOPY OF ONE "CRUZEIRO" FROM 1945 AND THOUSAND "RE¶IS" FROM 1939 FOR APPLICATIONS ON CULTURAL HERITAGE ANALYSIS: STUDY OF COINS
In this work, the technique of laser induced breakdown spectroscopy was developed for application in cultural heritage analysis in order to study coins of one \Cruzeiro" from 1945 and a thousand \R¶eis" from 1939, using a Nd:YAG laser operating in Q-switched mode. It had been determined the best conditions of laser and detection features such as pulse energ
Publicado em: 2008
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28. Determinação de paládio em amostras biológicas aplicando técnicas analíticas nucleares
This study presents Pd determinations in bovine tissue samples containing palladium prepared in the laboratory, and CCQM-P63 automotive catalyst materials of the Proficiency Test, using instrumental thermal and epithermal neutron activation analysis and energy dispersive X-ray fluorescence techniques. Solvent extraction and solid phase extraction procedures
Química Nova. Publicado em: 2008
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29. Caracterização química de tomates (Lycopersicon esculentum Mill.) empregando análise por ativação neutrônica instrumental / Chemical characterization of tomatoes (Lycopersicon esculentum Mill.) by using instrumental neutron activation analysis
The tomato is the second most cultivated vegetable after the potato, having an effective participation in the human diet. Its food value remains paradoxical. At same time it is recognized as a functional food with nutraceutical properties, the tomato receives criticism due to the way it is usually cultivated, i.e. under heavy amounts of synthetic fertilizers
Publicado em: 2008
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30. Simulação numérica da migração de elementos metálicos e do monômero -caprolactama de embalagens poliméricas irradiadas para simulantes de alimentos / SIMULATION STUDY OF -CAPROLACTAM MONOMER AND METALLIC ELEMENTS MIGRATION FROM IRRADIATED POLYMERIC PACKAGING INTO FOOD SIMULANTS
For decades migration study of chemical compounds from packaging into food, such as metals, residual monomers and additives, is a very important issue, concerning public health and minimize chemical contamination. In this work, it was done irradiations of packagings taken in contact with food simulant, and it was studied this migration through a mathematical
Publicado em: 2008
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31. Caracterização de Ametistas Naturais
This research intends to investigate the formation of color in samples of natural amethyst from different origins after submitting them to gamma irradiation, as well to develop an identification method of uncolored crystals with potential for development of color. The techniques of infrared spectroscopy, ultraviolet-visible spectroscopy and atomic emission s
Publicado em: 2008
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32. Estudos arqueométricos de sítios arqueológicos do baixo São Francisco / Archaeometrics studies of archaeological sites from Baixo São Francisco
O estudo minucioso das características físicas e químicas dos artefatos cerâmicos, associado com as pesquisas históricas e arqueológicas tem pennitido a reconstituição dos costumes culturais e modos de vida das comunidades antigas. O presente estudo objetivou estudar composição química elementar e mineralógica de cerâmicas arqueológicas coletad
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2007
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33. Composição elementar do material particulado presente no aerossol atmosférico do município de Sete Lagoas, Minas Gerais
The main objective of this study was the identification of sources generating particulate matter in the atmospheric aerosols of Sete Lagoas, Minas Gerais. The measurement of the mineral composition was accomplished by X-ray diffractometry and the elemental concentration by neutron activation analysis. The results showed that Al, Cl, Cu, Fe, K, Mg and Na are
Química Nova. Publicado em: 2007-10
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34. Critérios para avaliação da qualidade de sedimentos - Estudo de caso: Sub-bacia do Ribeirão Espírito Santo, afluente do Rio São Francisco / Criteria for evaluating sediment quality - Case Study: Sub-Watershed of Espírito Santo Stream; Affluent of the São Francisco River
Sediment Quality Values Guidelines (SQVG) have been used for evaluating ecological risk associated with the sediment contamination for benthonic organisms. The main objective of this work was to develop methodologies and to collect data that allowed the application of SQVG for the following metals: Cd, Cu, Pb, Ni and Zn. The location chosen for the case stud
Publicado em: 2007
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35. Participação de complexos de lantanídeos entre as fases de reservatório de petróleo
Traçadores são utilizados na explotação de reservatórios de petróleo para fornecer informações que auxiliam na otimização das operações envolvidas. Esta utilização já é comumente praticada fora do Brasil, sendo os mais empregados os radioativos, que apresentam sobre os compostos químicos as vantagens da simplicidade e sensibilidade de detec�
Publicado em: 2007
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36. Emprego do mÃtodo de ativaÃÃo neutrÃnica para acompanhamento de pacientes com IRC submetidos a diÃlise / Study of the method of Neutron Activation Analysis for clinical accompaniment of patients with CRI submitted to the Dialysis
O conhecimento da composiÃÃo quÃmica do organismo via anÃlises laboratoriais à uma ferramenta importante para o diagnÃstico e prognÃstico de enfermidades; alÃm de tambÃm ser Ãtil na avaliaÃÃo de tratamentos. Dentre os elementos analisados, estÃo os eletrÃlitos, cuja participaÃÃo à fundamental em vÃrios processos metabÃlicos, sendo a sua co
Publicado em: 2007