Shielding design in neutron activation experiment system based on D-T neutron tube

The deuterium-tritium neutron generator should be fully shielded for the safety of operators participating in experiments since D-T is commonly used activation experiments. In this study, MCNP5 code was to simulate shielding effect thermalization device previously designed by our group with Pb and boron-containing polyethylene as material. dose rate outside previous can not meet requirement, so a concrete wall needed between operators. Two models are walls. One model that experimental same room, another one there an L-shaped them. both models, less than 5 ?Svh-1.