RICARDO T. LOPES
12 resultados
Resultados de Busca
Agora exibindo 1 - 10 de 12
Artigo IPEN-doc 18416 Análise da influência de líquido e de material de revestimento externo na qualidade da imagem radiográfica de dutos offshore através de modelagem computacional2012 - SOUZA, E.M. de; CORREA, S.C.A.; JUNIOR, J.P.; SILVA, A.X. da; LOPES, R.T.Artigo IPEN-doc 09166 Performance of dose calibrators in Brazilian hospitals for activity measurements2001 - IWAHARA, A.; OLIVEIRA, A.E.; TAUHATA, L.; SILVA, C.J.; SILVA, C.P.G.; BRAGHIROLLI, A.M.S.; LOPES, R.T.Artigo IPEN-doc 15043 Development of a methodology for low-energy x-ray absorption correction in bioligicalsamples using radiation scatterring techniques2009 - PEREIRA, MARCELO O.; ANJOS, MARCELINO J.; LOPES, RICARDO T.Artigo IPEN-doc 12093 Patient dose study in chest radiographic examinations for diferent exposure techniques using Monte Carlo methods and voxel phatom2007 - CORREA, SAMANDA C.A.; SOUZA, EDMILSON M.; SILVA, ADEMIR X.; YORIYAZ, HELIO; LOPES, RICARDO T.Artigo IPEN-doc 20070 Kinetics of trace metal removal from tidal water by mangrove sediments under different redox conditions2014 - SUZUKI, K.N.; MACHADO, E.C.; MACHADO, W.; BELLIDO, A.V.B.; BELLIDO, L.F.; OSSO JUNIOR, J.A.; LOPES, R.T.Artigo IPEN-doc 20046 Removal efficiency of sup(75)Se, sup(51) Cr and sup(60)Co from tidal water by mangrove sediments from Sepetiba Bay (SE Brazil)2014 - SUZUKI, K.N.; MACHADO, E.C.; MACHADO, W.; BELLIDO, A.V.B.; BELLIDO, L.F.; OSSO JUNIOR, J.A.; LOPES, R.T.Mangrove sediment cores sampled from Sepetiba Bay (SE Brazil) were covered with tidal water spiked with 75Se, 51Cr and 60Co to evaluate the removal efficiency of these radiotracers by underlying sediments. Variable time-evolution trends were observed along 115 h experiments, with significant differences between removal efficiencies of all radiotracers observed only after 70 h ( 51Cr[60Co[75Se). After an event of 60Co release back to overlying water, there was a general trend of lower 60Co removal than observed for other radiotracers during the period from 20 to 54 h. After this event, alternated periods of higher 60Co and higher 75Se removal trends were observed, attributed to behavioural differences expected for such anionic and cationic radiotracers. While 75Se and 51Cr showed uniform time-evolution curves, as typically found in the literature for most radiotracers, 60Co removal rates presented oscillations, probably due to sensitivity to changes in redox conditions within underlying sediments. Results evidenced the role of mangrove sediments as trace element sinks, which have implications for coastal water quality and for possible uses of such sediments in wastewater treatment systems.Artigo IPEN-doc 18876 Selenium, Chromium and Cobalt Diffusion into Mangrove Sediments: Radiotracer Experiment Evidence of Coupled Effects of Bioturbation and Rhizosphere2012 - SUZUKI, KATIA N.; MACHADO, E.C.; MACHADO, W.; BELLIDO, A.V.B.; BELLIDO, L.F.; OSSO JUNIOR, J.A.; LOPES, R.T.Artigo IPEN-doc 16597 Dose and risk evaluation in thoracic radiology using male and female voxel phantoms2010 - CORREA, S.C.A.; SOUZA, E.M.; SILVA, A.X.; YORIYAZ, H.; LOPES, R.T.Artigo IPEN-doc 13746 Dose-image quality study in digital chest radiography using Monte Carlo simulation2008 - CORREA, S.C.A.; SOUZA, E.M.; SILVA, A.X.; LOPES, R.T.; YORIYAZ, H.Artigo IPEN-doc 09165 Performance of dose calibrators in Brazilian hospitals for activity measurements2002 - IWAHARA, A.; OLIVEIRA, A.E.; TAUHATA, L.; SILVA, C.J.; SILVA, C.P.G.; BRAGHIROLLI, A.M.S.; LOPES, R.T.