医用辐射三大分支中当数Ｘ射线诊断的应用历史久、普及广、影响大。因而Ｘ射线诊断的医疗照射占最大份额［１］，显然是医疗照射调查中最引人注目的。然而由于Ｘ射线诊断已广泛普及到乡镇卫生院，其防护监督管理任务重［２］，属此次“九五”期间医疗照射调查中难度相对较... The three branches of medical radiation in the number of X-ray diagnosis of a long history of application, wide spread, great impact. Thus the largest share of medical exposure to X-ray diagnostics [1] is clearly the most striking of the medical exposure surveys. However, as X-ray diagnosis has been widely popularized to township hospitals, the task of its supervision and management of heavyweights is heavy [2], which is more difficult in the investigation of medical exposure during the “Ninth Five-Year Plan” period.