A method to simulate the Resistive Plate Chambers (RPCs) gamma sensitivity
has been developed using a Monte Carlo code. The sensitivity has been evalu
ated as a function of the gamma energy in the range 0.1-100 MeV and for dif
ferent spectra. To evaluate the response of the detector in a Large Hadron
Collider (LHC) background environment the gamma energy spectrum expected in
the CMS muon barrel has been taken into account and the RPC gamma sensitiv
ity evaluated as a function of the detector size. (C) 2000 Elsevier Science
B.V. All rights reserved.