Stopping Power
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Aplicabilidade e validação do Geant4 para fótons e elétrons em radioterapia / GEANT4 applicability and validation to Photons and Electrons in Radiotherapy
Due to the increasing use of ionizing radiation in medical applications, in recent decades, the simulation codes for radiation interacting with matter, based on Monte Carlo Method, have been constantly adapted to applications in medical physics. TheMonte Carlo method is a statisticalmethod of numerical simulation of problems using essentially a sequence of r
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/06/2011
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2. A função administrativa e a proteção constitucional do direito de moradia
The administrative function is eminently teleological, since it is related to satisfying primary interests, and as such, finds itself supported by two basic principles: the supremacy of public interest over the private and the inalienability of public interests. In order to be valid, all administrative actions must follow the human beings principle of dignit
Publicado em: 2010
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3. Estudo sistemático do freamento de íons pesados em sólidos no regime de baixas velocidades / Systematic study of heavy ions stopping in solids at the low velocity regime
The energy loss of ions in materials is an important issue not only because of its direct applications on material analysis techniques, but also for the understanding of the interactions. Accurate knowledge of heavy ion stopping power at low energies is necessary in materials science as well as in basic physics, e. g. in the Doppler Shift Attenuation Method
Publicado em: 2009
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4. Modelagem computacional de tomografia com feixe de prótons / Computational modeling of protons tomography
In the present work a preliminary research via computer simulations was made in order to elaborate a prior program for the first experimental pCT setup in Brazil. Proton therapy is a high precise form of a cancer treatment. Treatment planning nowadays is performed basing on X ray Computer Tomography data (CT), alternatively the same procedure could be perfor
Publicado em: 2009
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5. Medida de uma curva contínua do poder de freamento de partículas alfa em Al na região do pico de Bragg / Mensure of the stopping power continuous curve for alpha particles in Al foils around the Bragg peak energy
We present in this work experimental energy loss curves for alpha particles in Al foils around the Bragg peak energy. Our method is based on an integration of the energy spectrum, combining elastic scattering in thick targets with transmission method, providing an almost continuous energy loss curve with $2-3\%$ precision. To achieve this precision we perfor
Publicado em: 2008
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6. Mesure of a continuos curve of stopping power for alpha particles in Al around region of Broogs peak / Aplicação do GEANT4 no estudo da influência da rugosidade da superfície de ânodos de tubos de raios X utilizados em radiologia diagnóstica
Estudos recentes utilizaram filtração com absorvedores de W para representar o efeito da rugosidade do ânodo. Para verificar a validade desta metodologia, neste trabalho, foram avaliados espectros de energia na faixa utilizada em radiologia diagnóstica convencional (40, 80 e 150 kV), gerados por tubos de raios X com ânodos rugosos por meio de simulaçõ
Publicado em: 2008
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7. Estudo da formação de rastos nucleares em polímeros / Study of the Nuclear Tracks Formation in Polymers
The research in the field of material modification with ion implantation has greately improved, stimulated by technological applications in biology, medicine, electronics and other related areas. One of the correlated aspects in understanding these new materials is the identification and characterization of the damage produced by ion beam irradiation. In thi
Publicado em: 2007
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8. The diaspora of the real estate capital, dynamics of valorization and the city in the contemporary capitalism : the irrationality in process / A diaspora do capital imobiliario, sua dinamica de valorização e a cidade no capitalismo contemporaneo : a irracionalidade em processo
The main issue to be dealt with in this thesis is realizing, by means of empirical and theoretical findings, what is the tight bond between financial capital and real estate capital, which interact in a systematic way so that capital accumulation becomes more powerful. By doing so it will be possible to build up a theoretical reflection -not only on the conn
Publicado em: 2007
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9. Filmes finos de iodeto de chumbo como detector de raios-X para imagens médicas / Lead Iodide Thin Films as X-ray detectors for Medical Imaging
In the last few years, great interest has been focused to high atomic number and wide band gap semiconductor materials for applications in room temperature ionizing radiation detection using the direct detection method. Some materials such as PbI2, HgI2, TlBr, CdTe and CdZnTe are good photoconductors and can be used at room temperature. As a good candidate,
Publicado em: 2007
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10. Study of stopping of natural Cu ions in Au at low velocities / Estudo do freamento de íons de Cu natural em Au em baixas velocidades
The energy loss of ions in materials is an important issue not only because of its direct applications in analytic techniques of materials but also for studying the basics of ion-atom interactions. Nevertheless, the Stopping Power of heavy ions in solids is still poorly understood which is especially true at low velocities mainly due to the complicated depen
Publicado em: 2005