Calculational and experimental study of the shield mock-ups characteristics

Characteristics of multilayer heterogeneous biological shields have been experimentally and theoretically studied. The study has been fulfilled on two compositions: ''dry'' shield (steel-lead-aluminium-boron carbide-aluminium) and ''wet'' shields (steel-lead-aluminium-boron carbide-water-aluminium). The experiments were performed in a cavity of the IR-50 reactor. The neutron field was calculated by the diffusion method. The data on neutron and gamma dose rates are presented, as well as on the fast and thermal neutron flux spatial distributions. In the whole there is a good agreement between the calculated and measured values. The results of search for an optimum ''dry'' composition ensuring minimum dose rates at the external surface are also presented