IGEO-SERVER.IGEO.UFRJ.BR PONTO DOS CONCURSOS PDF

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Dosimetry in intravascular brachytherapy; Calculos dosimetricos em braquiterapia intravascular. Among the cardiovascular diseases responsible for deaths in the adult population in almost all countries of the world, the most common is acute myocardial infarction, which generally occurs because igeo-serber.igeo.ufrj.br the occlusion of one or more coronary arteries.

Several diagnostic techniques and therapies are being tested for the treatment of coronary artery disease. Balloon angioplasty has been a popular treatment which is less invasive than traditional surgeries involving revascularization of the myocardium, thus promising a better quality of life for patients.

Recently, the idea of delivering high radiation doses to coronary arteries to avoid or delay restenosis has been suggested. Known as intravascular brachytherapy, the technique has been used with several radiation sources, and researchers have obtained success in decreasing the rate of restenosis in some patient populations. In order to study the radiation dosimetry in the patient and radiological protection for the attending staff for this therapy, radiation dose distributions for monoenergetic electrons and photons at nine discrete energies were calculated for blood vessels of diameter 0.

Specific calculations were carried out for several candidate radionuclides as well. Advantages and disadvantages of the various ckncursos and source geometries are discussed. The dosimetry developed here concurso aid in the realization of igeo-server.iigeo.ufrj.br benefits obtained in patients for this promising new technology. Construction of a computational exposure model for dosimetric calculations using the EGS4 Monte Carlo code and voxel phantoms; Construcao de um modelo computacional de exposicao para calculos dosimetricos utilizando o codigo Monte Carlo EGS4 e fantomas de voxels.

The MAX phantom has been developed from existing segmented images of igeo-server.igeo.uffj.br male adult body, in order to achieve a representation as close as possible to the anatomical properties of the reference adult male specified by the ICRP.

In pontl dosimetry, MAX can simulate the geometry of a igeo-server.igeo.hfrj.br body under exposure to ionizing radiations, internal or external, with the objective of calculating the equivalent dose in organs and tissues for occupational, medical or environmental purposes of the radiation protection.

Finally, some results of radiation protection, in the form of conversion coefficients between equivalent dose or effective dose and free air-kerma for external photon irradiation are presented and discussed.

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This paper shows some of the validation and comparison tests that have been carried out for the case of the F FDG. Unlike current programs eg. In addition, the software uses the latest information from nuclear decay of the ICRP The software is being widely put on trial and comparison with other methods of calculation available. Calculation of uncertainties; Calculo de incertidumbres. Ello supone la necesidad de la definicion del problema, la eleccion de los metodos de muestreo y medicion adecuados y la ejecucion de estas actividades para la obtencion de la informacion.

El resultado de una medicion solo es una aproximacion o estimacion del valor del mesurando, el cual se concuursos solo cconcursos va acompanado por una estimacion de la incertidumbre del proceso analitico. Segun el ‘Vocabulario de Terminos Basicos igeo-serrver.igeo.ufrj.br Generales de Metrologia’ la incertidumbre de medicion ‘es el parametro asociado con el resultado de la medicion que caracteriza la dispersion de los valores que razonablemente pudiera ser atribuida al mensurando o magnitud.

Este parametro podria ser una desviacion estandar o un intervalo de confianza’. La evaluacion de la incertidumbre exige que observemos detalladamente todas sus posibles fuentes, pero no de forma desproporcionada. Podemos realizar una buena estimacion de la incertidumbre concentrando el esfuerzo en las mayores contribuciones.

Los pasos fundamentales del proceso de determinacion de la incertidumbre en las mediciones son: Calculation of the Doppler broadening function using Fourier analysis; Calculo da funcao de alargamento Doppler utilizando analise de Fourier.

An efficient and precise method for calculation of Doppler broadening function is very important to obtain average group microscopic cross sections, self shielding factors, resonance integrals and others reactor physics parameter. In this thesis two different methods for calculation of Doppler broadening function and interference term will be presented.

Precise magnetostatic field using the finite element method; Calculo de campos magnetostaticos com precisao utilizando o metodo dos elementos finitos. The main objective of this work is to simulate electromagnetic fields using the Finite Element Method. Even in the easiest case of electrostatic and magnetostatic numerical simulation some problems appear when the nodal finite element is used.

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It is difficult igeo-serger.igeo.ufrj.br model vector fields with scalar functions mainly in non-homogeneous materials. With the aim to solve these problems two types of techniques are tried: Some numerical analysis of simple electromagnetic problems with homogeneous and non-homogeneous materials are performed using first, the adaptive remeshing based in various error indicators and second, the numerical solution of waveguides using edge finite element.

New neutronic calculations; Reactor RA An updating of the neutronic calculations performed at the RA-0 reactor, located at the Natural, Physical and Exact Sciences Faculty of Cordoba National University, are herein described.

In particular, the use of WIMSD4 code to make calculations on the reactor implies a novelty in the possible applications of this code to solve the problems that arise in practice. Se describen los calculos realizados hasta la igeo-server.igeo.ufej.br y los resultados obtenidos. Las tecnicas incorporadas al calculo de un reactor como el RA-0 permiten predecir en detalle el comportamiento del flujo en el interior del nucleo y en el reflector, igeo-server.igdo.ufrj.br que sera una importante ayuda en el diseno de experimentos.

En particular, el empleo del codigo WIMSD4 para calculos del reactor completo constituye una novedad en las posibles aplicaciones de ese codigo para resolver problemas que se presentan en la practica. Dosimetric calculations by Monte Carlo for treatments of radiosurgery with the Leksell Gamma Knife, homogeneous and non homogeneous cases; Calculos dosimetricos por Monte Carlo para tratamientos de radiocirugia con el Leksell Gamma Knife, casos homogeneo y no homogeneo.

In this pobto dose profiles are calculated that are obtained modeling treatments of radiosurgery with the Leksell Gamma Knife. This was made with the doz code Monte Carlo Penelope for an homogeneous mannequin and one not homogeneous. Its were carried out calculations with the irradiation focus coinciding with the center of the mannequin as in near areas to the bone interface.

Dosimetric calculation of I activity for the treatment to patients having differentiated thyroid cancer. Benefits and poto Calculo dosimetrico de la actividad de I para tratamiento de pacientes con cancer diferenciado de tiroides CADT. No important side effects should be pknto. Post treatment evolution was analysed. The retained activity in the body AR48 hs. Should have been less than 2. Directory of Open Access Journals Sweden. Les postes d’information du personnel et de controle en cas d’accident donnent des conseils techniques et sont pourvus de materiel auxiliaire mobile, notamment d’un anthroporadiametre.

Un service de laboratoire assiste les operations de dosimetrie: Les dosimetres de Hanford pour concurss accidents de criticite, places dans toute l’installation a des endroits facilement accessibles, sont ramasses et analyses. Ces dosimetres contiennent les memes feuilles d’elements que les dosimetres a film et constituent un second moyen d’estimer la dose recue par les personnes. Ademas de un programa de vigilancia y control de la exposicion del personal a las radiaciones, se ha organizado un sercicio dosimetrico de urgencia destinado a: Fluence to dose equivalent conversion coefficients provide the basis for the calculation of area and personal monitors.

Physic process are included for neutrons, photons and charged particles, and calculations are made for neutrons and secondary particles which reach the sensitive volume. Results obtained are thus compared with values published in ICRP Neutron fluence in the sensitive volume was calculated for benchmarking. Torque calculation in the induction motor with the finite element method; Calculo del par en el motor de induccion con el metodo del elemento concusros.

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In this work the method of the finite element is applied to the bi-dimensional igeo-server.igeo.furj.br of the induction motor in operation in steady state, excited by sine sources of laminar currents and sine sources of voltage.

The analysis is focused mainly in the calculation of the electromagnetic torque. The topics of electromagnetic theory are covered and in an idealized model of the induction motor, analytically and numerically with the method of the finite element, in the variant method of Galerkin, the vectorial potential and the torque are calculated.

The results obtained with the analytical and numerical methods are compared. Three formulations are developed to calculate the torque with the method of the finite element, using triangular elements of first order, based in the equation of force of Lorentz, the Maxwell tensor and the principle of the virtual work.

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Finally, a motor of induction of real characteristics is simulated, assuming it is connected to a three-phase voltage source.

In this motor it is analyzed the convergence and the evolution in the results obtained of the torque with different discretions, and the torque-velocity performance curve is calculated. El analisis se enfoca principalmente en el calculo del par electromagnetico. Se tratan los topicos de teoria electromagnetica involucrados y en un modelo idealizado del motor de induccion, se calculan analitica y numericamente con el metodo del elemento finito, en la variante metodo de Galerkin, el potencial vectorial y el par.

Se comparan resultados obtenidos con los metodos analiticos y numericos. Se desarrollan tres formulaciones para calcular el par con el metodo del elemento finito, utilizando elementos triangulares de dps orden, basadas en la ecuacion de fuerza de.

Algorithm for the igeo–server.igeo.ufrj.br of a steam generator efficiency; Algoritmo para kgeo-server.igeo.ufrj.br calculo de la eficiencia de un generador de vapor. The efficiency calculation of steam generators is not always simple. The purpose of this paper is to propose an algorithm for the calculation of steam generators efficiency, easy to understand and carry out, in the form of a series of steps to be followed.

It takes as starting point that the person in charge of applying these calculations has knowledge of the combustion processes and thermodynamic principles that rule such processes.

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Se toma como punto de partida, que la persona encargada de aplicar estos calculos tenga el conocimiento de los procesos de combustion y principios termodinamicos que rigen tales procesos. Quality control of dosimetric systems using thermoluminescent crystals; Control de calidad de un sistema de planeacion dosimetrico utilizando cristales termoluminiscentes y su aplicacion en tratamientos de pacientes con cancer de prostata. To achieve an optimal tumoral control to prostate cancer in early and locally advanced stages, it is necessary to increase the dose with a low mobility probability at the vesicle an rectal level.

This is achieved through conformal radiotherapy. The Instituto Nacional de Cancerologia uses this technique, but two questions arise from the medical-physicists and medical radio-oncologist: In accordance with clinical protocols, the conformal radiotherapy delivers a low dose to the adjacent healthy tissues. What experimental method exists that can prove with certainly the veracity of this affirmation?. And, Do the dosimetric simulation system calculate suitable the dose for each tissues?.

Through thermoluminescent dosimetry and the use of a physical simulator,we measured the absorbed dose at the target volume and the adjacent tissues using conformal and conventional radiotherapy. We proved that organs such as the rectum and bladder, receiver a minor dose in conformal radiotherapy, hence reducing their mobility probability.

In addition, the readings from the thermoluminescent dosimeters and the doses calculated by the ECLIPSE dosimetric system were compared, concluding that the patient’s prescribed dose is effectively delivered as recommended by the quality control program in radiotherapy. Ambientes virtuales de aprendizaje utilizando realidad aumentada. Radiodine treatment of hyperthyroidism with a simplified dosimetric approach.

Clinical results; Terapia radiometabolica dell’ipertiroidismo con approccio dosimetrico semplificato. Cattedra di Medicina Nucleare, Ist. Two patients were immediately submitted to a new radioiodine administration.

Only 2 of them required thyroxine treatment. The simplified dosimetric method illustrated in this paper is very effective in clinical practice because it permits to avoid resorting to sophisticated but also imprecise quantitative methods. Hypothyroidism should not be considered as a major collateral effect of radioiodine treatment, particularly in Graves’ disease.

In fact, the pathogenesis of the concusros requires an ablative treatment with both surgery and radioiodine treatment and the control of hyperthyroidism and conchrsos prevention of relapse are the major clinical targets. Vice versa, hypothyroidism was very uncommon in uni- and multinodular toxic goiter when the dosimetric approach was applied. Sono stati arruolati pazienti ipertiroidei sottoposti a ecografia e scintigrafia tiroidea con diagnosi di morbo di Graves-Basedow 43 pazientigozzo uninodulare tossico 57 pazienti e multinodulare tossico 89 pazienti.