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General gamma-radiation test of TGC detectors

The TGC detectors are expected to provide the Muon trigger for the ATLAS detector in the forward region of the ATLAS Muon Spectrometer. The TGC detectors have to provide a trigger signal within 25 ns of the LHC accelerator bunch spacing, with an efficiency exceeding 95%, while exposed to an effective)photon and neutron background ranging from 30 to 150 Hz/cm/sup 2/. In order to test TGC detectors in high rate environment every detector was irradiated at 2500 Cu Co-60 source in Radiation Facility of Weizmann Institute of Science at nominal operating voltage and at photon rate several times above the expected background. This radiation test was succeeded in diagnostics of the hot spots inside detectors. The present publication refers to the test results of 800 TGC detectors produced in the Weizmann Institute of Science.