MARGARIDA R. F. FRAGA
17 resultados
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Artigo IPEN-doc 22602 Rate effects in radiation detectors with resistive electrodes1998 - FRAGA, M.M.; LIMA, E.P. de; MARQUES, R.F.; POLICARPO, A.J.P.L.; BUENO, CARMEN C.; GONÇALVES, JOSEMARY A.C.; SANTOS, M.D. de S.Detectors with highly resistive electrodes, particularly RPCs, have been studied extensively in recent years. Several authors considered the effect of rate on the detector response (efficiency) and a few also associated with the rate, in a rather qualitative manner, the charge per event, i.e., the current. Here, without loss of generality of the results obtained, rate effects are studied with a classical cylindrical counter geometry and different gas mixtures. To a high accuracy, the observed behavior, both for the proportional mode and for the transition to streamers, is quantitatively and accurately interpreted as loss of voltage on the dielectric due to the current generated in the detector, with direct consequences for the local electric field in the avalanche region. Results obtained in the self quenching streamer (SQS) mode fail the previous interpretation and clearly need further research.Resumo IPEN-doc 09229 The transition from proportional to streamer mode in resistive detectors2003 - BUENO, C.C.; GONCALVES, J.A.C.; FRAGA, M.M.; LOPES, P.R.C.; SANTOS, M.D.S.Resumo IPEN-doc 07857 Scintillation light from microstructure detectors2000 - BUENO, C.C.; GONCALVES, J.A.C.; FRAGA, M.M.; FETAL, S.T.G.; FRAGA, F.A.F.; ANTUNES, E.; FERREIRA MARQUES, R.; POLICARPO, A.J.P.L.Resumo IPEN-doc 07847 Influence of a floating electrode on the behaviour of resistive detectors in the proportional and SQS region1999 - FRAGA, M.M.; LIMA, E.P.; FERREIRA MARQUES, R.; POLICARPO, A.J.P.L.; BUENO, C.C.; GONCALVES, J.A.C.; SANTOS, M.D.S.Resumo IPEN-doc 07869 Dynamic behaviour in resistive detectors1999 - FRAGA, M.M.; FERREIRA MARQUES, R.; IVANIOUCHENKOV, Y.; LIMA, E.P.; NEVES, F.; POLICARPO, A.J.P.L.; BUENO, C.C.; GONCALVES, J.A.C.; SANTOS, M.D.S.; COSTA, L.; MENDIRATTA, S.; MONTEIRO, J.H.Resumo IPEN-doc 07841 Use of the scintillation light for quality control of microstructure for gaseous detectors1999 - FRAGA, F.A.F.; FRAGA, M.M.; FERREIRA MARQUES, R.; GONCALO, J.R.; ANTUNES, E.; POLICARPO, A.J.P.L.; BUENO, C.C.Artigo IPEN-doc 12003 Low-energy internal conversion electrons spectrometry with a silicon diode2007 - SILVA, THIAGO R.; CAMARGO, FABIO de; GONCALVES, JOSEMARY A.C.; FRAGA, MARGARIDA R.F.; BUENO, CARMEN C.Artigo IPEN-doc 12000 sup(192)Ir solid sources activity measurements2007 - RIDENTI, MARCO A.; PASCHOLATI, PAULO R.; BETELHO, SUZANA; GONCALVES, JOSEMARY A.C.; LIMA, IARA B. de; VIVALDINI, TULIO C.; FRAGA, MARGARIDA R.F.; CALVO, WILSON A.; BUENO, CARMEN C.Artigo IPEN-doc 08297 Pressure dependence of secondary NIR scintillation in Ar and Ar/CFsub(4)2000 - FRAGA, M.M.; BUENO, C.C.; GONCALVES, J.A.C.; FRAGA, F.A.F.; FERREIRA MARQUES, R.; POLICARPO, A.J.P.L.Artigo IPEN-doc 06930 Transient behaviour and rate effects in resistive detectors1998 - FRAGA, M.M.; FERREIRA MARQUES, R.; IVANIOUCHENKOV, Y.; LIMA, E.P.; NEVES, F.; POLICARPO, A.J.P.L.; BUENO, C.C.; GONCALVES, J.A.C.; SANTOS, M.D.S.; COSTA, L.; MENDIRATTA, S.; MONTEIRO, J.H.