Space radiation is composed of many kinds of energetic particles

in which alpha particle is an important part. So

materials should be studied to protect from this kind of particles for deep space exploration. In this paper

using Monte Carlo method we have simulated high-energy alpha particles’ interaction with different materials like aluminum

polyethylene

water

and liquid hydrogen. Aluminum is not the best material to protect astronauts from space radiation according to the production of secondaries and the relation between projectile energy and range. And Bragg peak comes out at the end of the trajectory.