Encontrados 5 documentos, a visualizar página 1 de 1
Manufactured silicon diode used as an internal conversion electrons detector
Corrêa,A. A. S.; Bueno,Carmen C.; Gonçalves,Josemary A.C.; Mendes,P. F. P. Rato; Pinto,J. K. C.; Souza,J. P. de; Santos,M. D. de S.In this work we have studied the direct detection and spectrometric capabilities for internal conversion electrons of an ion-implanted diode, developed in the framework of R&D programs at CERN, envisaging its use in an electron-gamma coincidence system for nuclear parameters measurements. The best energy resolution obtained until now, 12.6 keV (FWHM) for the 133Ba 320.32 keV electron emission, is sufficiently g...
On the origin of the satellite peaks in alpha particle spectra
Camargo,F.; Bueno,Carmen C.; Gonçalves,Josemary A. C.; Mendes,P. F. P. Rato; Pinto,J. K. C.; Souza,J. P.; Santos,M. D. S.In this work we describe the results obtained with S3590-06 and ion-implanted diodes for alpha particle spectrometry. Satellite peaks were also investigated in order to identify not only the origin of these phenomena, but also the importance of the guard ring region on their relative intensities. The preliminary results indicate that the true cause of the spurious satellite peaks might be associated with the we...
Two-parameter analysis of the temporal behaviour of resistive detectors
Peixoto,Tiago P.; Pascholati,Paulo R.; Vanin,Vito R.; Bueno,Carmen C.; Gonçalves,Josemary A.C.The biggest constraint in the RPCs operation is the drop of their efficiency with the counting rate, consequence of charge gain decrease. This effect is normally attributed to the voltage drop on the dielectrics, although not supported by quantitative measurement. In this work we present the first results of a two-parameter analysis of the charge pulse height time variation from a cylindrical resistive detector...
Transient behaviour and rate effects in resistive detectors
Fraga, M. M.; Marques, R. Ferreira; Ivaniouchenkov, Y.; Lima, E. P. de; Neves, F.; Policarpo, A. J. P. L.; C. Bueno, Carmen; Gonçalves, Josemary A. C.The dependence of the detection efficiency (or charge gain) of a resistive detector on the counting rate has been considered by several authors. The influence of the resistivity of the electrodes, the counter geometry and the gas mixture composition have also been studied. Most of those measurements assume a stationary regime. In the present work we report on studies of the transient behaviour of detectors with...
Rate effects in a proportional counter with resistive cathode
Bueno, Carmen C.; Fraga, M. M.; Gonçalves, Josemary A. C.; Marques, R. Ferreira; Policarpo, A. J. P. L.; Santos, M. Damy de S.In this work, the rate effects associated with the gain of detectors with resistive electrodes are considered. To study these effects it was decided to use the classical proportional counter geometry, with a cylindrical glass tube as the cathode, rather than parallel plate devices. Indeed, the generality of the information obtained is not affected and the cylindrical proportional counter geometry has several ad...
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