放射治疗是肿瘤治疗的重要手段。９０年代以来，我国肿瘤放射治疗事业发展很快，单位和设备均有较大幅度增加。尤其医用加速器、后装治疗机、用于立体定向放疗的γ刀和Ｘ刀不断增多。加强相应放射卫生监督管理势在必行。因此迫切需要搞好“九五”期间放射治疗的医疗照射水... Radiation therapy is an important means of cancer treatment. Since the 1990s, the cause of cancer radiotherapy in our country has been developing rapidly with a dramatic increase in both units and equipment. In particular, medical accelerators, after-treatment machines, γ-knife and X-knife for stereotactic radiotherapy continue to increase. It is imperative to strengthen the supervision and administration of radiation health. Therefore, there is an urgent need to improve the medical irradiation water for radiation therapy during the Ninth Five-Year Plan period.