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Resistive bulk Micromegas chambers, produced at CERN, have been installed at the new CERN Gamma Irradiation Facility (GIF++) in order to study the effects of ageing and to evaluate the detector behaviour under high irradiation. The chambers have an active area of 10×10cm2, strip pitch of 400μm and an amplification gap of 128μm. We present the detector performance as a function of the background ra
