Nuclear Instrumentation
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Teste de linearidade em medidor de atividade: utilização do radioisótopo 99mTc versus 18F
Objetivo: Avaliar a viabilidade de substituir o radioisótopo 18F pelo 99mTc no teste de linearidade em medidores de atividade. Materiais e Métodos: O teste foi realizado empregando-se fontes de 99mTc (62 GBq) e 18F (12 GBq), cujas atividades foram mensuradas até valores abaixo de 1 MBq. As razões e desvios entre as atividades experimentais e teóricas f
Radiol Bras. Publicado em: 2015-02
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2. Implementação e análise de medidas de reações por meio de coincidências -partícula / Implementatios and analyses of measurements in reaction using Y-particle coincidents
A reação 18O+110Pd foi estudada utilizando o espectrômetro Y Saci-Perere do laboratório do acelerador Pelletron (LAFN-IFUSP-DFN) numa faixa de energia de 2; 5 a 3; 3 MeV por núcleon. O objetivo foi o estudo do mecanismo de reações nucleares por meio de coincidências Y-partícula, implantando essa técnica e vericando como os efeitos de integração d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/10/2011
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3. Sistema de monitoramento de feixe baseado em radiação óptica de transição (ROT) / Beam diagnostic device based on Optical Transition Radiation (OTR)
Quando uma partícula carregada em movimento uniforme cruza a superfície entre dois meios de propriedades eletromagnéticas diferentes, ela emite a chamada Radiação de Transição (RT). Esta radiação tem espectro amplo, com emissão inclusive no intervalo de radiação visível. Esse processo de produção de radiação tem sido muito empregado em siste
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/07/2011
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4. Comparison between experimental data and numerical modeling for the natural circulation phenomenon
The study of natural circulation phenomenon has been object of crescent interest in scientific community in recent years. The new generation of compact nuclear reactors uses natural circulation of the fluid as a residual heat removal cooling system in case of accident or shutdown. The objective of this paper is to present a comparison between experimental da
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011
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5. DIGITAL SIMULATION SYSTEM OF NEUTRON PARAMETERS OF THE TRIGA IPR-R1 NUCLEAR RESEARCH REACTOR / SISTEMA DIGITAL PARA SIMULAÇÃO DOS PARÂMETROS NEUTRÔNICOS DO REATOR NUCLEAR DE PESQUISA TRIGA IPR-1
The IPR-R1 TRIGA Mark I nuclear research reactor, at the Nuclear Technology Development Center (CDTN), is a pool type reactor cooling by light water. TRIGA reactors (Training, Research, Isotope, General Atomics) were designed for research, training and radioisotope production. The International Atomic Energy Agency (IAEA) recommends the use of safety and fri
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/07/2010
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6. AvaliaÃÃo dos parÃmetros dosimÃtricos em feixes de FÃtons de Radioterapia usando fototransistor SMT
One of the biggest challenges in radiotherapy dosimetry is to certify that the prescribed dose is given to the patient. For this, it is necessary to use small detectors to evaluate the beam parameters. Current dosimetry is realized with detectors that highlight problems: high cost, difficulty in handling, absence of real time readout, complex and delayed obt
Publicado em: 2008
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7. Development of a computacional model for calculations of absorved dose to organs and tissues of the human body in situations of accidental exposures / Desenvolvimento de um modelo computacional para cÃlculos de dose absorvida em ÃrgÃos e tecidos do corpo humano nas situaÃÃes de exposiÃÃes acidentais
Exposure to a radiation field may be of medical, environmental, occupational or accidental nature, but in all cases the main objective is the determination of the whole body absorbed dose or the distribution of absorbed dose to specific organs and tissues. In recent years, estimates of the radiation absorbed dose in the human body have become more accurate d
Publicado em: 2006
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8. TEMPORAL MODELLING OF THE WATER DISCHARGES MEASUREMENTS ON FUNIL DAM (RJ) USING NEURAL NETWORK AND STATISTICAL METHODS / MODELAGEM TEMPORAL DAS MEDIDAS DE VAZÃO DE DRENOS NA BARRAGEM DE FUNIL (RJ) UTILIZANDO REDES NEURAIS E MÉTODOS ESTATÍSTICOS
In works of great responsibility (ports, dams, nuclear power, etc.), the amount of instrumentation data may allow the construction of models for the temporary variability of the properties of interest based on neural network techniques. In case of dams, the monitoring through the installation of an instrumentation system plays a fundamental part in the evalu
Publicado em: 2005
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9. Espectroscopia de multicoincidencia aplicada ao estudo de moleculas
The main purpose of this thesis is to study selective photo-fragmentation processes of free molecules excited by synchrotron radiation using multi-coincidence spectros-copy. Below are summarized some original and important contributions of this work: 1) We show for the first time experimental evidences of ultrafast dissociation in water molecule after O1s ®
Publicado em: 2002
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10. Development of the technology of nuclear magnetic resonance tomography (ToRM) / Desenvolvimento da tecnologia de tomografia por ressonância magnética nuclear
We describe in this work the development of hardware and software necessary to implement the Magnetic Resonance Imaging (MRI) techniques. Our major subjects were the construction of an acquisition and control system which allowed the operation of a pulsed Fourier NMR spectrometer as a NMR Tomograph; further we oriented the developing of a NMR spectrometer wh
Publicado em: 1987
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11. Sistema eletrometrico digital computerizado para dosimetro de eletreto
This work is a contribution to the development of instrumentation based on Brazilian research and technology .A Digital Computerized Eletrometric System for radiation dosimetry with electrets was developed and built by us. It may be used in hospitals, research laboratories, nuclear centers, dosimetry systems in general and has also possible aplication in soi
Publicado em: 1984
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12. Applications of natural-abundance nitrogen-15 nuclear magnetic resonance to large biochemically important molecules.
Natural-abundance nitrogen-15 nuclear magnetic resonance spectroscopy of enzymes and other biopolymers is found to be feasible using newly available instrumentation. The long correlation times of such molecules result in short spin-lattice relaxation times, and these in turn allow rapid signal accumulation. The advantages of short T1 values are sometimes off