Optimization of a partially non magnetic primary radiation shielding for the triple axis spectrometer PANDA at the Munich high flux reactor FRM-II

Monte Carlo simulations have been used to optimize the monochromator shielding of the polarized cold neutron triple axis spectrometer PANDA at the Munich high flux reactor FRM-II. By using the Monte Carlo program MCNP-4B the destiny of the total spectrum of incoming neutron and gamma radiation from the beam tube SR-2 have been determined during the 3-dimensional diffusion process in different types of heavy concrete and other absorbing material. Special attention has been paid to build a compact and highly efficient shielding, partially non-magnetic, with a total biological radiation dose of less than 10 µSv/h at its outsides. Specially considered was the construction of an albedo reducer, which serves to reduce the background in the experiment outside the shielding.