Radiation shielding and CuCr1Zr/Pb/PE and Fe/Pb/PE beam dump design for 220-MeV electron linear accelerator

Abstract

This paper addresses the radiation issues, in particular the photon and neutron shielding, associated with the radiation shielding room and beam dump design for the 220-MeV electron linear accelerator. The energy deposition of a 220 MeV electron dump was investigated to determine the radius and length of the core of the dump with different materials. The angle of the primary shield relative to the beam direction was studied to design the perpendicular and lateral shield wall for the linear accelerator shielding room. In addition, the labyrinth design had been considered in this case. FLUKA Monte Carlo code has been computed to perform attenuation studies of photon and neutron radiation which were produced by the electromagnetic shower and photon interactions of materials. The prompt radiation fields which are photons and neutrons distributions in this design were observed. Two types of beam dump have been investigated. The first one is composed of CuCr1Zr, lead, and polyethylene. Another one is similar, but the first layer material was changed from CuCr1Zr to iron. The simulation results revealed that the beam dump and radiation shielding wall exhibit excellent performance in attenuating both photon and neutron radiation. The capability of beam dumps to absorb electron energy is well-designed. The dose distributions around the shielding room are below the design criteria, which can be applied to use for the 220-MeV electron linear accelerator.