An RPC $\gamma$ irradiation test

LHC muon trigger detectors are supposed to work for 10 yr under an intense flux of radiation. Therefore, in the framework of ATLAS, the performance of full and reduced size RPC prototypes, heavily irradiated with gamma sources, were measured for variable incident fluxes. We introduce here a detector description in terms of the "global" parameters based on experimental data such as current, total counting rate and gamma fluxes. In this test the ATLAS final front- end electronics was used for the first time. (4 refs).