Radiation Monitors
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Ultraviolet radiation emitted by lamps, TVs, tablets and computers: are there risks for the population?
AbstractThe frequent human exposure to various types of indoor lamps, as well as other light sources (television monitors, tablets and computers), raises a question: are there risks for the population? In the present study the emission of UVA and UVB radiation by lamps and screens of electronic devices were measured in order to determine the safe distance be
An. Bras. Dermatol.. Publicado em: 2015-08
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2. Análise das variáveis de entrada de uma rede neural usando teste de correlação e análise de correlação canônica / Analysis of input variables of an artificial neural network using bivariate correlation and canonical correlation
The monitoring of variables and diagnosis of sensor fault in nuclear power plants or processes industries is very important because an early diagnosis allows the correction of the fault and, like this, do not cause the production interruption, improving operators security and its not provoking economics losses. The objective of this work is, in the whole of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/09/2011
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3. Increased micronucleated cell frequency related to exposure to radiation emitted by computer cathode ray tube video display monitors
It is well recognized that electromagnetic fields can affect the biological functions of living organisms at both cellular and molecular level. The potential damaging effects of electromagnetic fields and very low frequency and extremely low frequency radiation emitted by computer cathode ray tube video display monitors (VDMs) has become a concern within the
Genetics and Molecular Biology. Publicado em: 2005-09
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4. Individual monitoring for external exposures: experimentation and simulation with Monte Carlo Method / Monitoração individual externa: experimentos e simulações com o método de Monte Carlo
In this work, we have evaluated the possibility of applying the Monte Carlo simulation technique in photon dosimetry of external individual monitoring. The GEANT4 toolkit was employed to simulate experiments with radiation monitors containing TLD-100 and CaF2:NaCl thermoluminescent detectors. As a first step, X ray spectra were generated impinging electrons
Publicado em: 2005
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5. Estudo da resposta de monitores de radiaÃÃo para mediads de equivalente de dose ambiental H*(10)
O equivalente de dose ambiental, H*(10), à definido como o equivalente de dose produzido por um campo de radiaÃÃo expandido e alinhado, a uma profundidade de 10 mm em uma esfera ICRU. Essa grandeza operacional à recomendada pela ComissÃo Internacional de Unidades e Medidas da RadiaÃÃo (ICRU) para a monitoraÃÃo de Ãrea. Com base na sua definiÃÃo,
Publicado em: 2005
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6. 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
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7. Complementation of the defects of DNA synthesis in irradiated and unirradiated ataxia-telangiectasia cells.
Mutant subtypes in the human genetic disease ataxia-telangiectasia (A-T) were classified by means of an assay system that monitors complementation of defects in DNA synthesis. Anomalies in DNA synthesis have been observed previously in A-T cells, both in their failure to inhibit DNA synthesis immediately after exposure to ionizing radiation and in their prol
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8. Heterologous expression of the human cyclin-dependent kinase inhibitor p21Cip1 in the fission yeast, Schizosaccharomyces pombe reveals a role for PCNA in the chk1+ cell cycle checkpoint pathway.
Fission yeast cells expressing the human gene encoding the cyclin-dependent kinase inhibitor protein p21Cip1 were severely compromised for cell cycle progress. The degree of cell cycle inhibition was related to the level of p21Cip1 expression. Inhibited cells had a 2C DNA content and were judged by cytology and pulsed field gel electrophoresis to be in the G
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9. The Schizosaccharomyces pombe rad11+ gene encodes the large subunit of replication protein A.
Replication protein A (RPA) is a heterotrimeric single-stranded DNA-binding protein present in all eukaryotes. In vitro studies have implicated RPA in simian virus 40 DNA synthesis and nucleotide excision repair, but little direct information is available about the in vivo roles of the protein. We report here the cloning of the largest subunit of RPA (rpa1+)
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10. A novel mutant allele of Schizosaccharomyces pombe rad26 defective in monitoring S-phase progression to prevent premature mitosis.
A semipermissive growth condition was defined for a Schizosaccharomyces pombe strain carrying a thermosensitive allele of DNA polymerase delta (pol delta ts03). Under this condition, DNA polymerase delta is semidisabled and causes a delay in S-phase progression. Using a genetic strategy, we have isolated a panel of mutants that enter premature mitosis when D