对射线的化学防护,至今还有不同的定义。广义的说法,是由化学物质减弱射线的作用,或者说成化学物质有促进与增强由射线引起的损伤的恢复作用。化学防护剂在概念上分为:在照前给予显示效果的称为预防药,在照后给予显示效果的称为治疗药。把这二类分开只是在最近,以前统称为防护 There are still different definitions of chemical protection against radiation. In a broad sense, it is the role of chemical substances in weakening rays, or chemical substances have the function of promoting and enhancing the damage caused by radiation. Chemical protectants are conceptually divided into: preventive drugs that give a display effect before exposure, and therapeutic drugs that give display effects after exposure. The separation of these two categories was only recently, previously known collectively as protection.