Track Detectors
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Detecção e localização de vazamentos em tubulações utilizando sistemas acústicos e redes neurais / Leak detection and location in pipelines through acoustic method and neural networks
Pipeline networks are complex systems of ducts used nowadays for gas and chemical products transporting through long distances. They frequently cross highly populated regions, water supplies or natural reserves. Even small leaks in pipelines can lead to great losses of products and serious damages to the environment before it could be detected. With the purp
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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2. Estudo da exalação de radônio em placas e tijolos de fosfogesso de diferentes procedências / Study of radon exhalation from phosphogypsum plates and blocks from different origins
O fosfogesso é um resíduo da indústria de fertilizantes fosfatados que concentra radionuclídeos naturais. Neste trabalho foi estudada a taxa de exalação de 222Rn em placas e tijolos de fosfogesso, visando sua utilização na construção de residências. Para tanto, foram determinadas a taxa de exalação de 222Rn por meio da técnica da câmara de acu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/12/2011
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3. Sobre a influência de fatores ambientais nos níveis de radônio em cavernas dos Parques Estaduais do Vale do Ribeira, SP e avaliação do equilíbrio radioativo e fator de equilíbrio entre radônio e seus descendentes / On the influence of environmental factors on radon levels in caves of Ribeira Valley State Parks, SP and evaluation of radioactive equilibrium and equilibrium factor between radon and its progeny
In the present study it was carried out the monitoring of radon in caves distributed among three state parks of Sao Paulo. The radon concentration were determinate in Morro Preto and Santana caves, located at PETAR Parque Estadual Turístico do Alto Ribeira (High Ribeira River Tourist State Park), Diabo cave, situated in PEJ Parque Estadual de Jacupiranga (J
Publicado em: 2011
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4. Estudo comparativo das respostas de monitores de Rn-222 que utilizam o CR-39 como detector de tracos de particulas alfa / Response comparative study os Rn-222 alpha particle track monitors
This work was a comparative study between the responses of three monitors, the NRPB, an acrylic monitor (in thin film geometry) and the aluminum monitor (also thin film geometry) in controled and mixed environment. The experiments consisted on placing the monitors in a plastic tube, with a radio-226 source internal. Only internal CR-39 plastic detectors were
Publicado em: 2010
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5. Gamma-induced modification on optical band gap of CR-39 SSNTD
Effect of gamma irradiation on optical absorption of nuclear track detectors like CR-39 was studied in different absorbed doses using ultraviolet-visible (UV-VIS) spectroscopy. The existence of the peaks, their shifting and broadening as a result of gamma irradiation has been discussed. The width of the tail of localized states in the band gap (Eu) was evalu
Brazilian Journal of Physics. Publicado em: 2008-12
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6. Digital system to characterize solid state nuclear track detectors
A digital system to characterize solid state nuclear track detectors(SSNTD) has been developed. It was used in the study of two detectors and its performance evaluated by comparing the obtained results with those determined by using an analog system, already in use for such purpose. The comparison of the results together with the feasibility and rapidness in
Brazilian Journal of Physics. Publicado em: 2007-06
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7. Avaliação da exposição ao ²²²Rn nas cavernas do Parque Estadual Turístico do Alto Ribeira (PETAR) / 222Rn exposure assessment in the caves of Parque Estadual Turístico do Alto Ribeira (PETAR)
No presente trabalho foram determinadas as concentrações de radônio em seis cavernas do Parque Estadual Turístico do Alto Ribeira (PETAR) e foi estimada a dose efetiva anual recebida pelos guias turísticos da região. O PETAR apresenta quatro núcleos de visitação: Santana, Ouro Grosso, Caboclos e Casa de Pedra e recebe anualmente cerca de 40 mil visi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/07/2006
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8. Gamma-ray tracking with segmented HPGe detectors
This paper gives a brief overview of the technical progress that can be achieved with the newly available segmented HPGe detectors. Gamma-ray tracking detectors are a new generation of HPGe detectors which are currently being developed to improve significantly the efficiency and resolving power of the 4pi germanium detectors arrays for high-precision gamma-r
Brazilian Journal of Physics. Publicado em: 2003-06
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9. Neutron anisotropy and X-ray production of the FN-II dense plasma focus device
The FN-II Dense Plasma Focus is a small (< 5kJ ) Mather type device, where the dependence of neutron yield and its anisotropy, in terms of deuterium filling pressure, and the neutron emission angular distribution have been studied. Two diferent electrode configurations have been tested, showing that their geometry plays an important role both on neutron yiel
Brazilian Journal of Physics. Publicado em: 2002-03
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10. Deuterium plasma focus measurements using solid state nuclear track detectors
A camera obscura technique was used to investigate the spatial distribution of fusion protons emitted from a small deuterium plasma focus device operated in its neutron-optimized regime (14 kV, 3 kJ, and 400 Pa D2 gas). An indium-foil activation detector was employed simultaneously to measure the shot-to-shot neutron yield. The camera obscura was positioned
Brazilian Journal of Physics. Publicado em: 2002-03
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11. Estudo da emanação de radonio em amostras de concreto com composições diferentes
The radon-222 is a noble radioactivity gas present in uranium-238 decay chain. The concrete components (cement and aggregates) have their raw materials extracted from crust that contains uranium as impurity. The 238U contained in these components will decay following its decay chain until 206Pb, passing by radon that can diffuse to indoor air of dwellings. T
Publicado em: 2002