Measurement of gas and volatile elements production rates in molten lead bismuth target

Production rates of gas and volatile elements produced following spallation raction of 1.4 GeV protons on a liquid LBE target have been measured. The experiment was performed at the ISOLDE facility at CERN. These data are of great interest for the developments of targets for accelerator driven systems such as MEGAPIE. Calculations were performed using the Monte Carlo code FLUKA coupled with an evolution code such as ORIHET3. Preliminary results show good comparison with MC data for Hg and for noble gases. For other elements such as I results indicate that only a fraction of the produced isotopes are released.