放射治疗虽只有几十年的历史,目前已成为治疗肿瘤的主要方法之一,大约60%左右的肿瘤病人要用它。当恶性肿瘤细胞受照射时会使正在进行核分裂的细胞几乎立即死亡,经过反复照射就可使癌瘤完全被毁灭。但是放射线不是对所有恶性肿瘤都有作用,有的经过照射 Although radiation therapy has only a history of several decades, it has become one of the main methods for treating tumors. About 60% of cancer patients use it. When malignant cells are irradiated, cells that are undergoing nuclear fission will almost instantly die, and repeated irradiation will completely destroy cancerous tumors. However, radiation does not have an effect on all malignant tumors, and some are irradiated.