辐射防护剂又称“抗辐射药物”,本来是指照射前使用对电离辐射损伤有一定程度预防作用的药物。但随着研究工作的发展,其内容已经扩大到包括照射后早期使用的有效治疗药物。但现有辐射防护剂还不能完全防止损伤的发生,而只能在某种程度上减轻这种损伤。如与其它治疗措施结合应用,能大辐度提高治疗效果,甚至可使放射损伤减轻到亚临床水平或仅出现轻微症状。 Radioprotective agent, also known as “anti-radiation drugs”, originally refers to the use of radiation before irradiation to prevent injury to a certain extent the role of drugs. However, with the development of research work, its contents have been expanded to include effective therapies used early after irradiation. However, the existing radioprotectants have not been able to completely prevent the occurrence of the damage but only reduce the damage to some extent. When used in combination with other therapies, it can greatly improve the therapeutic effect and even reduce the radiation injury to subclinical level or only mild symptoms.