The objective function is equivalent dose at the specific position in the back of the material.Furthermore, the particle numbers is also selected as object function.

• 优化目标函数主要选用一定厚度下核辐射透过材料后的总剂量当量，也选用过一定厚度下核辐射透过材料后的粒子数目作为优化的目标函数。