目的:检测137　Cs事故受照7.5年后淋巴细胞染色体易位,并与事故后初始双着丝粒频率相比较,探讨用于辐射剂量重建的基础。方法:12例格埃尼亚事故受照者,在1995年3月(事故后7.5年)取血进行细胞遗传学检查,事故后估算的受照剂量为0.2～4.6Gy。外周血样在RPMI1640培养液中培养48h, OBJECTIVE: To detect chromosomal translocations of lymphocytes after 137 Cs exposure for 7.5 years and to investigate the basis for radiation dose reconstruction compared with the initial dicentromere frequency after accident. METHODS: Twelve patients who were enrolled in the Guennia accident were enrolled in a cytogenetic study of blood taken in March 1995 (7.5 years after the accident). Estimated doses after the accident ranged from 0.2 to 4.6 Gy. Peripheral blood samples were cultured in RPMI1640 medium for 48h,