CARLOS HENRIQUE DE MESQUITA
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Resumo IPEN-doc 01836 Caracteristicas do cristal CsI(Tl) acoplado com fotodiodo1991 - HAMADA, M.M.; MESQUITA, C.H.; RELA, P.R.; SHIRAISHI, F.Resumo IPEN-doc 07803 Estudo de dano da radiacao nos detectores plasticos cintiladores1998 - HAMADA, M.M.; RELA, P.R.; COSTA, F.E.; MESQUITA, C.H.Artigo IPEN-doc 09722 Radiation damage in scintillator detector chemical compounds. A new approach using PPO-toluene liquid scintillator solution as a model2001 - MESQUITA, C.H.; FERNANDES NETO, J.M.; DUARTE, C.L.; RELA, P.R.; HAMADA, M.M.Artigo IPEN-doc 09723 Development of a simplified phoswich detector configured with plastic scintillator blocks coupled to double photomultiplier tubes1991 - MESQUITA, C.H.; HAMADA, M.M.; RELA, P.R.Artigo IPEN-doc 04169 Estudo do desempenho da combinacao do cristal de CsI(Tl) com o fotodiodo tipo PIN1992 - HAMADA, M.M.; MESQUITA, C.H.; RELA, P.R.; HASHIMOTO, T.; SHIRAISHI, F.Artigo IPEN-doc 06903 Radiation damage studies on the optical and mechanical properties of plastic scintillators1998 - HAMADA, M.M.; RELA, P.R.; COSTA, F.E.; MESQUITA, C.H.Artigo IPEN-doc 12023 Description of two tomography systems developed at IPEN-CNEN/SP2007 - TETZNER, GUARACIABA de C.; HAMADA, MARGARIDA M.; MADI FILHO, TUFIC; VASQUEZ, PABLO A.S.; RELA, PAULO R.; CALVO, WILSON A.P.; MESQUITA, CARLOS H.Artigo IPEN-doc 06904 Radiation damage studies on the optical and mechanical properties of plastic scintillators1999 - HAMADA, M.M.; RELA, P.R.; COSTA, F.E.; MESQUITA, C.H.Artigo IPEN-doc 09152 Radiation damage in scintillator detector chemical compounds: a new approach using PPO-toluene liquid scintillator as a model2002 - MESQUITA, C.H.; FERNANDES NETO, J.M.; DUARTE, C.L.; RELA, P.R.; HAMADA, M.M.Artigo IPEN-doc 14922 Gamma-ray computed tomography SCANNERS for applications in multiphase system COLUMNs2009 - CALVO, WILSON A.P.; HAMADA, MARGARIDA M.; SPRENGER, FRANCISCO E.; VASQUEZ, PABLO A.S.; RELA, PAULO R.; MARTINS, JOAO F.T.; PEREIRA, JOAO C.S. de M.; OMI, NELSON M.; MESQUITA, CARLOS H. deGamma-ray tomography experiments have been carried out to detect spatial patterns in the porosity, in a 0.27 m diameter packed steel column using a first generation computed tomography (CT) system. The CT scanner consists of a NaI(Tl) detector 5.08 cm in diameter, and an encapsulated 137Cs (3.7 GBq) radioactive source, located opposite to the center of the detector. The detector and the source, mounted on a fixed support and the column, can rotated and dislocate by two stepping motors controlled through a microprocessor. Different sizes of stainless steel Raschig rings (12.6, 37.9 and 76 mm) have been examined. The primary objective of this work is to detect spatial patterns and statistical information on porosity variation in packed distillation columns. Horizontal scans, at different vertical positions of the packed bed were made for each size of Raschig rings. Radial porosity variation within the packed bed has been determined. This study has demonstrated that the porosity and its spatial distribution in a metallic packed column can be measured with adequate spatial resolution using the gamma-ray tomography technique. After validation of this first generation CT, the turntable design to rotate and dislocate the 60Co or 137Cs sealed gamma-ray sources and multidetector array for the third generation industrial computed tomography was also developed.