目的　了解长期小剂量、低剂量率职业受照者的细胞遗传学变化。方法　以外周血淋巴细胞浓集法对安徽省阜阳市 94名医院放射科从业人员于 1990年、1992年、1994年、1996年和 1998年连续 5次作微核检测 ;采用归一化工作量估算法对受检者进行个人剂量估算。结果　平均年当量剂量均 Objective To understand the cytogenetic changes in long-term, low-dose occupational exposure. Methods Peripheral blood lymphocyte concentration method was used to make micronucleus test in radiology department of 94 hospitals in Fuyang City, Anhui Province for five consecutive times in 1990, 1992, 1994, 1996 and 1998. Using normalized workload Estimation method of the subject for personal dose estimation. Results Average annual equivalent dose