摘要
放射治疗是治疗恶性肿瘤的主要方法之一，已经专门为治疗癌症诞生了一百多年。放射治疗是利用各类加速器所产生的不同能量的X射线、电子、中子、质子、重离子以及放射源释放出的伽玛射线（如钴60治疗机、头、体部伽玛刀）来杀灭肿瘤细胞。
Abstract
radiation therapy is one of the main method of treatment of malignant tumor, has been designed specifically for cancer treatment was born more than one hundred years. Radiation therapy is the use of different energy X ray produced by various kinds of accelerators, electron, neutron, proton and heavy ion and the release of radioactive sources gamma rays(such as cobalt 60 therapy apparatus, head, body gamma knife) to kill tumor cells.
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