Rate effects in radiation detectors with resistive electrodes

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 c...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 1998-06, Vol.45 (3), p.263-268
Main Authors: Fraga, M.M., de Lima, E.P., Ferreira Marques, R., Policarpo, A.J.P.L., Bueno, C.C., Goncalves, J.A.C., de S. Santos, M.D.
Format: Article
Language:English
Subjects:
Breakdown voltage
Cathodes
Counting circuits
Dielectric losses
Electrodes
Geometry
Laboratories
Radiation detectors
Surface resistance
Voltage measurement
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Summary: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.
ISSN:0018-9499
1558-1578
DOI:10.1109/23.682391