Introduction of the muonic and Cerenkov effects in the EGS4 code

An absolute calibration and a signal modelling is realised to diminish the discrepancies of the results. In a first part, we redefine rapidly the Crenkov effect and the model introduced inside the EGS4 Monte Carlo Code in order to simulate it. This approach permits the development of new technics for the registration of cosmic rays based on Cerenkov light in the atmosphere and the estimation of atmospheric transparency. In a second part we describe the telescope used and the comparison between the experimental and theoretical results obtained. (orig.)