Radiation Qualities
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Monitoração de doses em radiologia: a calibração de medidores do produto kerma-área (PKA)
Objective The authors have sought to study the calibration of a clinical PKA meter (Diamentor E2) and a calibrator for clinical meters (PDC) in the Laboratory of Ionizing Radiation Metrology at Instituto de Energia e Ambiente - Universidade de São Paulo. Materials and Methods Different qualities of both incident and transmitted beams were utilized in condi
Radiol Bras. Publicado em: 2013-12
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2. CARACTERIZAÇÃO DE DISPOSITIVOS ELETRÔNICOS PARA DOSIMETRIA EM TOMOGRAFIA COMPUTADORIZADA. / CHARACTERIZATION OF ELECTRONIC DEVICES FOR DOSIMETRY IN COMPUTED TOMOGRAPHY.
Computed tomography (CT) is an examination of high diagnostic capability that delivers high doses of radiation compared with other diagnostic radiological examinations. The current CT dosimetry is mainly made by using a 100 mm long ionization chamber. However, it was verified that this extension, which is intended to collect all scattered radiation of the si
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/03/2012
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3. Caracterização e aplicação de duas câmaras de extrapolação em feixes padronizados de radiação X / Characterization and application of two extrapolation chambers in standard X radiation beams
The extrapolation chambers are ionization chambers with variable volume, and they are mainly utilized as beta radiation detectors. In this work two extrapolation chambers were characterized, a commercial PTW extrapolation chamber and another extrapolation chamber developed at the Calibration Laboratory of IPEN, for application as reference systems in mammogr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/03/2011
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4. Metodologia de controle de qualidade e implantação de campos padrões de radiação X, nível mamografia, seguindo a norma IEC 61267 / Quality control methodology and implementation of X-radiation standards beams, mammography level, following the standard IEC 61267
In this work it was developed and applied a quality control program of the Xradiation system (160 kV, constant potential, target of tungsten) of the Calibration Laboratory of IPEN(LCI) in the energy range relative to mammography beams (from 25 kV to 35 kV). The X radiation standards beams, level mammography, using molybdenum and aluminum as additional filtra
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/11/2010
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5. Implantação de um programa de controle de qualidade em equipamentos de raios x por meio de medidores não invasivos / Establishment of an X radiation equipment quality control programme using non invasive meters
The objective of this work was to study the behavior of the mainly X ray equipment calibration laboratory of IPEN, operated in the range from 25 kV to 150 kV using a PTW non invasive meter, model DiavoltTM, and an ORTEC spectrometry system, model NOMAD-PLUS 92X, for the establishment of a quality control programme. The Diavolt meter was used for measurements
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/09/2010
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6. Estabelecimento de um novo método de calibração de câmaras de ionização tipo lápis para dosimetria em feixes de tomografia computadorizada / Establishment of a new calibration method of pencil ionization chamber for dosimetry in computed tomography
Pencil ionization chambers are used for beam dosimetry in computed tomography equipment (CT). In this study, a new calibration methodology was established, in order to make the Calibration Laboratory of Instituto de Pesquisas Energéticas e Nucleares (LCI) suitable to international metrological standards, dealing with specific procedures for calibration of t
Publicado em: 2010
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7. Efeitos da radiação gama nas qualidades nutricionais, sensoriais e na resistência a Lasioderma serricorne (F.) e Plodia interpunctella (H.) em grãos de soja Glycine max (L.) / Effects of the gamma radiation in nutritional, sensory qualities and resistance of Lasioderma serricorne (F.) e Plodia interpunctella (H.) in soybean grains Glycine max (L.).
With the increasement of the world population, criative strategies will be necessary to increase food prodution. To achieve this chalenge, new cultivars have been development, though different tecniques and with characteristics to improve the production. To maintain food conservation, several methods can be used. The use of Cobalto-60 radiation is a secure a
Publicado em: 2010
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8. X-ray beam qualities for dental radiology purposes / PadronizaÃÃo de qualidade de feixes de raios-X para uso em radiologia odontolÃgica
In order to establish characteristics or properties of equipment for diagnostic radiology, e.g. ion chambers and semiconductor detectors, calibration laboratories offer a set of well-defined radiation conditions, called X-ray qualities, which can be used for many Physics studies and medical purposes. These X-ray qualities can be determined in terms of: (a) X
Publicado em: 2009
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9. X-ray beam qualities for dental radiology purposes / PadronizaÃÃo de qualidade de feixes de raios-X para uso em radiologia odontolÃgica
In order to establish characteristics or properties of equipment for diagnostic radiology, e.g. ion chambers and semiconductor detectors, calibration laboratories offer a set of well-defined radiation conditions, called X-ray qualities, which can be used for many Physics studies and medical purposes. These X-ray qualities can be determined in terms of: (a) X
Publicado em: 2009
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10. Efeito do processamento por radiação de 60Co na Erva-mate (Ilex paraguariensis) / EFFECT OF 60CO RADIATION PROCESSING IN MATÉ (Ilex paraguariensis)
The maté (Ilex paraguariensis), a native species from South America, is mainly consumed as typical beverage called chimarrão and tererê. An important problem that has been afflicting this product since a long time is its natural fungal contamination responsible to affect its physical, health and nutritional qualities. In order to improve this product qual
Publicado em: 2009
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11. Avaliação dos efeitos da radiação gama em vegetais da espécie Brassica olareaceae minimamente processados / EVALUATION OF THE EFFECTS OF GAMMA RADIATION ON THE VEGELABLES OF Brassica oleracea SPECIES MINIMALLY PROCESSED
The consumption of collard greens (Brassica oleracea cv. acephala) and broccoli (Brassica oleracea L. var. italica) has been inversely associated with morbidity and mortality caused by degenerative diseases. These species are highly consumed in Brazil, which enables its use as minimally processed (MP). The growing worldwide concern with the storage, nutritio
Publicado em: 2009
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12. STANDARDIZATION OF THE FRICKE GEL DOSIMETRY METHOD AND TRIDIMENSIONAL DOSE EVALUATION USING THE MAGNETIC RESONANCE IMAGING TECHNIQUE / Padronização do método de dosimetria Fricke gel e avaliação tridimensional de dose empregando a técnica de imageamento por ressonância magnética
This study standardized the method for obtaining the Fricke gel solution developed at IPEN. The results for different gel qualities used in the preparation of solutions and the influence of the gelatin concentration in the response of dosimetric solutions were compared. Type tests such as: dose response dependence, minimum and maximum detection limits, respo
Publicado em: 2009