Radiation For Electron Beam
Mostrando 13-24 de 37 artigos, teses e dissertações.
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13. 66Ga como padrão de calibração de raios de altas energias para detectores HPGe / Ga66 as a standard for high energy gamma rays
This work involves the study of the peak efficiency and response function of HPGe detectors for gamma rays in the energy range of 2 to 5 MeV, somewhat above the energy range of the available calibration sources for gamma spectroscopy. It is part of a high energy (up to 20MeV) -ray project to obtain intensity of rays from photo nuclear reactions produced with
Publicado em: 2008
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14. EPDM addition or maleic anhydride in a final LDPE/PA6 blende and its properties. / Adição de EPDM ou anidrido maléico na blenda LDPE/PA6 e suas propriedades finais.
In virtue of the increasing volume of the multilayers packings use in the food preservation, the study for the recycling of these materials through its reverse speed-exploitation as raw material and the transformation in new products or materials becomes necessary. Amongst some types of recycling used currently, the polymers blendes formation with discarded
Publicado em: 2008
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15. Avaliação do desempenho de embalagens para alimentos quando submetidas a tratamento por radiação ionizante / Evaluation of performance of food packagings when treated with ionizing radiation
In this study the mechanical properties (tensile strength and percentage elongation at break and penetration resistance), optical properties, gas oxygen and water vapor permeability, the overall migration tests into aqueous food simulant (3% aqueous acetic acid) and fatty food simulant (n-heptane), as well as the formation of volatile radiation product tests
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/03/2006
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16. Ionic desorption in valence- and core- excited polymers: poly(vinyl chloride) and poly(vinylidene chloride)
Photon stimulated ion desorption (PSID) studies have been performed in poly(vinyl chloride) (PVC) and poly(vinylidene chloride) (PVDC) using synchrotron radiation, covering from valence to core electron (Cl 2p and C 1s) energy ranges. Data acquisition was performed at the TGM beam line from the Brazilian Synchrotron Light Source (LNLS), operating in a multi-
Brazilian Journal of Physics. Publicado em: 2006-06
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17. Desenvolvimento de um equipamento para dosimetria por luminescÃncia oticamente estimulada (LOE)
In recent years the Optically Stimulated Luminescence (OSL) has become a popular procedure for the dosimetry of the ionizing radiation. OSL arises from the recombination of charges which has been optically released from electron traps within the crystal. The electron population in the traps is the result of irradiation of the material, and thus the OSL inten
Publicado em: 2006
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18. IONIZING RADIATION EFFECT STUDY BY ELECTRON BEAM ON ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE VIRGIN AND RECYCLED INDUSTRIAL / "Estudo do efeito da radiação ionizante por feixe de elétrons sobre o polietileno de ultra alto peso molecular virgem e reciclado industrial"
Ultra High Molecular Weight Polyethylene (UHMWPE) is an engineering plastic which has several applications, chiefly, in specific areas of the industry and medicine. UHMWPE can be even for other applications such as: port fenders, current guide, bucket coating, silos and gutters, plugs, pulleys and surgical prosthesis. This range of applications is due to the
Publicado em: 2006
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19. A influência dos parâmetros do vento solar na emissão de AKR durante tempestades magnéticas / The influence of the solar wind parameters on the AKR emission during magnetic storms
Several phenomena could be better studied and even disclosed after the development of the satellites and spacecrafts. Auroral Kilometric Radiation (AKR) is one of these phenomena. AKR was first detected only about thirty years ago; its typical frequencies are too low to penetrate earthward across the ionosphere. This radiation is generated through wave-parti
Publicado em: 2006
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20. UtilizaÃÃo do dosÃmetro Fricke para dosimetria de mÃquinas teleterapÃuticas, irradiadores gammacel e aparelhos de raios-X superficiais
The chemical dosimetry has been used as a reference in the measurement of the absorbed dose, with the Fricke dosimeter, at standardization laboratories. This dosimeter is considered an absolute dosimetric standard for measurements of radiation doses ranging from 20 to 400 Gy, covering a wide energy spectrum, from X-ray, g-ray to fast electron beam. The objec
Publicado em: 2006
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21. Monte Carlo simulation as an auxiliary tool for electron beam quality specification for intra-operative radiotherapy
Intra-operative radiotherapy (IORT) using electron beams has demonstrated to be a good alternative as part of the breast-conserving surgery. Besides, as the computer processing capacity has been increasing along the years, it has become a potential auxiliary tool in radiotherapy treatment planning. In this work these streams are merged together: simulations
Brazilian Journal of Physics. Publicado em: 2005-09
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22. High precision system for magnetic field measurements of insertion devices of the Brazilian Synchroton Light Source / Sistema de alta precisão para as medições dos campos magneticos dispositivos de inserção do Laboratorio Nacional de Luz Sincroton
This Thesis was a consequence of the need for an accurate and precise magnetic field measurement bench for insertion devices characterization (IDs). Such devices are versatile radiation sources installed in Electron Storage Rings. From their magnetic field profile, they provide high photon fluxes, with broad or monochromatic spectrum, being possible, dependi
Publicado em: 2005
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23. Electron Cyclotron Emission in the TCABR Tokamak: An Experimental Study. / "Emissão Eletrociclotrônica no Tokamak TCABR: Um Estudo Experimental"
In this work, an experimental study of the Electron Cyclotron Emission (ECE) in the TCABR Tokamak, is described. An ECE sweeping heterodyne radiometer, operating in the 50-85 GHz frequency range, was installed, calibrated and used to detect ECE radiation in the second harmonic extraordinary mode from thermal plasma discharges. The noise temperature, amplitud
Publicado em: 2005
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24. Linear polarization of photons produced by the electron plane channeling in a silicon crystal
We present the results of the polarization and intensity measurements versus photon energy Egamma = 5 - 35 MeV for the photon beam produced by the electron plane channeling with the energies 1.2 and 1.5 GeV in silicon crystals 500 mum and 290 mum thick along the (110) plane. The comparison with results of another research group and theoretical calculations i
Brazilian Journal of Physics. Publicado em: 2003-03