Radiation calculations for the main shielding wall for LHCb,2nd Part

Radiation fields behind the main shielding wall separating the LHCb detector from its counting rooms have been calculated for different conceptual designs using the Monte Carlo code FLUKA. Implication of different wall thicknesses as well as of appropriately shielded access openings and cable ducts on the radiation level behind the shielding wall are examined. It is shown that leakage of stray radiation through the vertical shafts to the surface of the earth gives rise to doses that are less than dose equivalent limit for Supervised Radiation Area.1