我们采用历史前瞻性调查方法,在我院职工中开展了恶性肿瘤死亡调查。以1972年12月职工名册中的职工为观察对象,分为放射组(放射工作人员)和对照组(非放射工作人员),观察期为13年(1973—1985年)。放射组人员自开始受照到1985年底止,人均累积剂量为25mSv(男29mSv,女12mSv);13年间放射组累积观察20523人·年,对照组 We conducted a prospective investigation of the history of malignant tumor deaths among workers in our hospital. The employees in the employee list in December 1972 were taken as the observation objects, and were divided into radiological group (radiological staff) and control group (non-radiological staff). The observation period was 13 years (1973-1985). Radiation group from the beginning of exposure to the end of 1985, the cumulative average per capita dose of 25mSv (male 29mSv, female 12mSv); 13 years cumulative observation of radioactive group 20,523 person-years, the control group