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 source
s, were measured for variable incident fluxes. We introduce here a detector
description in terms of the ''global" parameters based on experimental dat
a such as current, total counting rate and gamma fluxes. In this test the A
TLAS final front-end electronics was used for the first time. (C) 2000 Else
vier Science B.V. All rights reserved.