Abstract
We present recent results of an extensive aging test, performed at the CERN Gamma Irradiation Facility, on two bakelite Resistive Plate Chambers (RPC) detectors. With a method based on a model describing the behavior of an RPC exposed to a large particle flux, we have periodically measured the electrode resistivity ρ of the two detectors over 3 years. We observed a large increase of ρ with time, from initial values of about 10 10 Ω cm to more than 200×10 10 Ω cm . A corresponding degradation of the RPC rate capability, from about 3 kHz/cm 2 to less than 200 Hz/cm 2 , was observed. The reversibility of the process, using a humid gas mixture, has also been studied.
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