恶性肿瘤是一种常见病、多发病,已成为严重威胁人类健康的疾病。全球每年有近500万人死于癌症,它已成为人类死亡的重要原因。放射性方法是肿瘤治疗的一个非常重要的手段。然而,由于射线既能杀死癌细胞,也可杀死正常组织的细胞,对人体造成伤害。因此,在实施放射性肿瘤治疗时,要 Malignancy is a common disease, frequently-occurring disease, has become a serious threat to human health diseases. Nearly 5 million people worldwide die of cancer each year, which has become an important cause of death in humans. Radioactive method is a very important means of cancer treatment. However, as the rays kill both cancer cells and cells of normal tissues, they can cause harm to the human body. Therefore, in the implementation of radioactive tumor treatment, it is necessary