| Space radiation ionizing radiation sources mainly come from space, including the Van Allen Belts, Galactic Cosmic Ray and Solar Particle Events. Serious influence can be caused to the astronauts and electronics system inside the spacecraft when the protons, electrons and high-energy heavy ion in the space radiation environment interact with the spacecraft. When astronauts to work long hours in the space radiation environment or their walk to inspect the work, passes through the body’s tissues and cells interact and transmit energy, may induce gene mutation, cause irreparable serious damage to the human body. GEANT4 is used to simulate particles toolkit of a transport process in the material developed by CERN. Now it has become a very powerful general card program, all kinds of particles can be used to simulate by GEANT4. According to the needs to choose the appropriate interaction process and physical model, build the different geometric shapes of shielding layer. In order to achieve the best effect of space radiation environment simulation. We can simulate the transport process and calculate the absorber after shield energy deposition, depth dose distribution within the model, the incidence of the primary type of secondary particles and energy spectrum can also be considered. Get the radiation environment where the astronauts in after radiation shielding. Astronauts and electronic devices for further analysis of the capsule of absorbed dose to provide simulation data which can be used to guarantee the safety of the astronaut orbit to provide data support.GEANT4 software issued in this article, based on the Monte Carlo method to simulation space high-energy Fe ion incident four kinds of shielding materials, we analyzed the transmission of the shield materials with primary particles and secondary electron, secondary neutrons, secondary protons and secondary γenergy spectrum, energy deposition in the absorber and depth dose distribution in water. Secondary heavy particle type and energy has also been analyzed, and compare the four types of shielding materials for high-energy shielding properties of Fe ion.The results showed that:1: To the 56 GeV56 Feof space high-energy ion incident quality thickness of 1.35 g/cm2 aluminum, polyethylene, carbon and water four kinds of shielding materials, the stopping power of the polyethylene materials for high energy Fe particles is the biggest, absorb the most energy 2.16×10~7MeV, the energy of the primary particles through the shielding material is the lowest, followed by liquid water for the shield, the aluminum shielding material for high energy Fe particles is the worst, which absorb only 1.67×10~7MeV, Most incident high-energy Fe particles through Al materials will deposit energy in the absorber.2: Of all the secondary particles produced by shielding material, secondary neutron and secondary proton produced wider range energy spectrum, and its energy is larger, secondary electron and secondary γray energy spectrum are similar, the main energy concentrated at 0.1 MeV and 30 keV3: To the secondary particles in the water absorber energy deposition, the secondary electron and secondary γrays deposit the major energy in the absorber surface, but secondary neutron and secondary protons can reach inside of the absorber, the energy deposit changes with the depth of the absorber is relatively slow.4: To the four kinds of shielding materials, aluminum, polyethylene, carbon and water with the thickness of 1.35 g/cm2,theatomnumber of secondary particle which produced by the four shielding material is mainly the secondary heavy nucleus between 22 to 26,the secondary particle with atom number of 3 to 10 is very small. |
PDF Full Text Request