Fig. 1. Interaction between the charged particles and target materials

Fig. 2. Schematic diagrams of the FMC and RMC methods^［52］

Fig. 3. Shielding configurations^［51］

Fig. 4. Analysis results with the FASTRAD tool^［77］

Fig. 5. Optimized design results with the ERETCAD tool^［78］

Fig. 6. Comparison of the accuracy of the RT and MC methods^［12］

Fig. 7. Comparison of the simulation results from different tools including Geant4，MCNP，FASTRAD，NOVICE，SPENVIS and ERETCAD-Rad^{［16，47］}