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本文报道了３９例在５个月内多次受到１３７Ｃｓγ射线源照射（累积当量剂量为５～２１０５ｍＳｖ），受照人员外周血淋巴细胞微核的随防观察。结果表明，照后１年直接法微核率受照和对照组接近，差异无显著性意义。此时，常规培养法微核率，受照组高于对照组，差异接近显著（０１＞Ｐ＞００５），并且微核率与剂量之间存在相关关系。在照后５年，采用ＣＢ法测试微核，结果受照组微核率明显高于对照组，差异有非常显著性意义（Ｐ＜００１）。表明ＣＢ法提高了微核测试的灵敏度和可靠性。
In this paper, 39 cases were exposed with 137Cs gamma ray source (cumulative equivalent dose of 5 ~ 2105mSv) within 5 months. The micronuclei of peripheral blood lymphocytes in the irradiated persons were observed with the prevention. The results showed that 1 year after irradiation, the direct method micronucleus rate in the control group was close, the difference was not significant. At this time, the micronucleus rate of routine culture method was higher in the irradiated group than in the control group, with a significant difference (01> P> 005). There was a correlation between the micronucleus rate and the dose. In the 5 years after irradiation, the micronucleus test by CB method showed that the micronucleus rate of the irradiated group was significantly higher than that of the control group, the difference was significant (P <001). This shows that the CB method increases the sensitivity and reliability of the micronucleus test.