Methods: Human peripheral blond lymphocyte (PBL) proliferation method was used and the population were classified by the length of service, classes of work and cumulated absorb dose.

• 方法：用外周血淋巴细胞细胞培养法对放射工作人员进行微核检测并按工龄、工种、累积吸收剂量等分类并设立对照组进行微核率的比较。