SHIELDING PROPERTIES OF IRON AT HIGH-ENERGY PROTON ACCELERATORS STUDIED BY A MONTE-CARLO CODE

Shielding properties of a lateral iron shield and of iron and concrete shields at angles between 5-degrees and 30-degrees are studied by means of the Monte Carlo program FLUNEV (DESY-D3 version of the FLUKA code extended for emission and transport of low energy neutrons). The following quantities were calculated for a high energy proton beam hitting an extended iron target: total and partial dose equivalents, attenuation coefficients, neutron spectra, star densities (compared also with the CASIM code) and quality factors. The dependence of the dose equivalent on the energy of primary protons, the effect of a concrete layer behind a lateral iron shielding and the total number of neutrons produced in the target were also estimated.