Radiation Shielding Calculations of 100MeV Proton Beam Bombarded to Mass Radioisotope Produced Target

Abstract

A Monte Carlo simulation was carried out to estimate dose equivalent rate in a radiation shield configuration of a 100MeV-proton target station for radioisotope mass production. In this study, we consider the dose rates of photons and neutrons at working places, where a worker may be exposed to the radiations during the machine operation near a target room. A radiation shielding configuration for the target is designed optimally by estimating radiation dose rates of photons and neutrons with respect to various shielding materials, which are used to reduce the radiation dose rates below acceptable limits. In this proposed model, the proton beam line from the accelerator to the target is constructed in tunnel under the ground. A pathway to the target room is designed with a width of 1.7 meters for workers accessing to the machine. The radiation shielding walls were consisted of concrete blocks including lead stacked with a dimension of 0.8 meters thickness. To ensure the distribution of the radiation dose beyond the shielding walls, we allocated the pathway into 15 different points for the purpose of visualizing the variations of dose rate.