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Activity measurements of 192Ir solid sources using a well-type ionization chamber
Gonçalves, J. A. C.; Botelho, S.; Pascholati, P. R.; Ridenti, M. A.; Fraga, M. M. F. R.; Camara, J. R.; Calvo, W. A.; Bueno, C. C.This work presents the preliminary activity measurements of 192Ir solid sources, applied in industrial gammagraphy, produced by the Sealed Sources Laboratory in the Radiation Technology Center (CTR) at IPEN-CNEN/SP. The pellets' activity measurements were carried out with a well-type ionization chamber developed at CTR. The chamber current-voltage response was studied as a function of 192Ir activities ranging f...
Effect of the drift field on avalanche gain and charge collection in microgap d...
Fraga, F. A. F.; Marques, R. Ferreira; Gonçalves, J. A. C.; Gonçalo, J. R.; Policarpo, A. J. P. L; Eijk, C. W. E. van; Hollander, R. W.One of the main drawbacks of the use of microgap structures when used at high pressure (6 bar) at high count rates (~106 s-1 mm-2) is the limited maximum safe gain at which they can be operated. The use of a preamplification device such as the GEM (gas electron multiplier) can overcome this limitation; however, secondary space charge effects due to charge accumulation at the non-metallic surfaces cannot be negl...
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