Dosimetry Thermoluminescence
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Desenvolvimento e estudo de materiais termoluminescentes baseados em óxido de alumínio para aplicação em dosimetria / Development and study of thermoluminescent materials based on aluminum oxide for dosimetry application
The aluminum oxide was one of the former compounds investigated with a view to detecting and measuring radiation by means of the thermoluminescence (TL). Commonly referred to as \"alumina\", aluminum oxide has interesting features for the development of materials for dosimetry. Its effective atomic number has an intermediate value between the bone and soft t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/04/2012
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2. Manufacturing polycrystalline pellets of natural quartz for applications in thermoluminescence dosimetry
This paper describes the manufacturing process of quartz-pellets and shows their potential use as thermoluminescence dosimeters (TLD) for those applications where low-levels of ionising radiation are present. Two batches of cold-pressed pellets were produced and their resistance were evaluated by vibration tests and weight-loss measurements. The batch manufa
Materials Research. Publicado em: 10/07/2012
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3. Avaliação de dosímetros termoluminescentes para uso em radioterapia com fótons de alta energia / Evaluation of thermoluminescent dosimeters for using in radiotherapy with high energy photons
Atualmente a maior parte dos tratamentos radioterápicos é feita através de irradiações com feixes de fótons de alta energia. Esses feixes se originam em fontes radioativas (de nuclídeos como o cobalto 60) ou são gerados em aceleradores lineares de elétrons. Para as medidas dosimétricas nesses feixes, uma das técnicas mais utilizada é a termolumin
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/08/2011
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4. Síntese e caracterização de elemento sensor de matriz KAISi3O8, dopadas com Mn ou Gd, obtidos pela técnica sol-gel, visando a aplicação em dosimetria das radiações ionizantes por termoluminescência e luminescência opticamente estimulada. / Synthesis and caracterization of sensor element of kalSi3O8 matrix, doped with mn and gd, obtained by sol-gel method, for application in ionizing radiation dosimetry by thermoluminescence and optically stimulated luminescence.
Neste trabalho, estudou-se as propriedades termoluminescentes e fotoluminescentes (em processo anti-Stokes), além de algumas propriedades químicas e físicas, de amostras sintéticas de KAlSi3O8, dopadas com Mn ou Gd, obtidas por meio da técnica sol-gel. O objetivo principal do estudo foi a obtenção de um novo material, com possibilidades reais de aplic
Publicado em: 2010
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5. Luminescence dosimeter based on magnesium doped aluminum oxide: production and characterization. / Confecção e caracterização de dosímetro luminescente de óxido de alumínio dopado com magnésio.
The aim of the present work is to obtain and characterize luminescent dosimeters made of magnesium doped aluminium oxide, for ionizing radiation dosimetry purposes. The material is produced by Pechini Method (US Patent 3.330.697, 1967), starting from a polymer that generates powder ceramic, after firing at predetermined temperatures. Dosimetric measurements
Publicado em: 2008
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6. Luminescence and paramagnetic centers in antigorite and Lizardite, two menbers of serpentine group: a comparative study / Estudo comparativo entre as propriedades dos centros luminescentes e paramagnéticos da antigorita e da lizardita do grupo da SERPENTINA: `Mg IND.3´[Si IND.2´`O IND.5´]`(OH) IND.4´
In this work, we are describing crystals luminescent properties of Antigorite (monoclinic, Mg3-x[Si2O5](OH)4-2x) and Lizardite (triclinic, Mg3[(Si,Fe)2O5](OH)4). They were studied simultaneously applying several techniques, like: Thermoluminescence (TL), Optical Absorption (OA), Electron Paramagnetic Resonance (EPR), X-rays diffraction and Inductively Couple
Publicado em: 2008
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7. AvaliaÃÃo da dose em radioterapia crÃnio-espinhal para meduloblastoma / AvaliaÃÃo da dose em radioterapia crÃnio-espinhal para meduloblastoma
O Meduloblastoma à um Tumor Neuroectodermal Primitivo da Fossa Posterior (PNET-FP), sendo biologicamente agressivo com predominÃncia entre as faixas etÃrias de 5 a 10 anos e de 24 a 34 anos. O tratamento à realizado de maneira conjunta pelo cirurgiÃo, neurologista e o radioterapeuta. Quando possÃvel, à iniciado com cirurgia para mÃxima remoÃÃo do t
Publicado em: 2008
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8. Estudo da resposta de cristais de quartzo natural para dosimetria termoluminescente
In the last few years, a number of studies have been carried out with the objective of characterizing and/or developing materials with thermoluminescence properties (TL) for the purpose of ionizing radiation dosimetry. The aim of this study consists in the characterization of the thermoluminescence properties of natural quartz crystals, to be used for radiat
Publicado em: 2005
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9. Thermal and sctructural properties of the CaB4O7-CaB2O4 system viewing the development of thermoluminescent dosimeter / Propriedades térmicas e estruturais do sistema CaB4O7-CaB2O4 visando o desenvolvimento de dosímetro termoluminescente
Borate glasses containing modified oxides have been studied on account of their effective atomic number close to that of the human tissue, what makes them interesting materials for the development of the thermoluminescent dosimeters. The purpose of this work was to study the thermal and structure properties of the xCaB4O7-(100-x)CaB2O4 system with x ranging
Publicado em: 2005
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10. Dosimetria gama e concentração de 222Rn em ambientes de trabalho fechados da cidade de São Paulo / Gamma dosimetry and 222Rn concentration in indoor workplaces of São Paulo
In this work we present the evaluation of the ambient gamma dose rates and the concentration of 222Rn in the air of 16 rooms of radiotherapy centers and 15 places of seven subway stations in the city of São Paulo. The places included in this study were indoor places with continuous permanence of workers. The deepest working places of the subway stations in
Publicado em: 2005
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11. Panorama das exposições médicas em radiologia convencional no Estado de São Paulo / Overview of the medical exposures in coventional radiology in the State of São Paulo
Patients dosimetry, associated with the assessment of the performance of the radiological equipment and of the series of procedures employed in the accomplishment of the examinations, plays fundamental role in the radiation protection system of medical exposures. Therefore, a large-scale survey of absorbed doses was carried out in health services localized i
Publicado em: 2005
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12. Implementação de Grandezas Operacionais na Monitoração Individual e de Área / Implementation of new operational quantities in the Individual and area monitoring
Operational quantities have been implemented to be applied in individual and area routine monitoring against external radiation exposure. This procedure is based on the use of an ideal combination of thermoluminescent detectors inside a monitor: two pellets of CaF2, one covered by a lead filter of (0,50 ± 0,05) mm and another one without filter and one TLD-
Publicado em: 2000