前言已经证明X线诱导染色体畸变比诱导姐妹染色单体互换有效得多(Perry and Evans 1975,Pont et al,1976),低水平电离辐射所致损害的检测已在体外使用畸变作为一种损害标志成功地进行了研究(Kucerováet al.1972,Luchnik and Sevattkaev1976,Pant et al,1976,Schmickel 1967)。在1978年莫斯科第十四届国际遗传学会议上,Serra等介绍了一篇论文,报告了持续接受小剂量照射的受试组人群的每个淋巴细胞的姐妹染色单体互换平均数显著增加。Serra等人过去关于淋巴细胞体外急性X线照射不使SCE频率增加的报导是出人预料的。但是如果他们的发现被证实了,那么对于我们理解SCE形 Preface It has been shown that X-ray induced chromosomal aberrations are much more effective than induction of sister chromatid exchange (Perry and Evans 1975, Pont et al., 1976). Detection of lesions caused by low levels of ionizing radiation has been used in vitro as aberrations The marker was successfully studied (Kucerová et al. 1972, Luchnik and Sevattkaev 1976, Pant et al, 1976, Schmickel 1967). At the 14th International Genetics Conference in Moscow in 1978, Serra et al. Introduced a paper reporting a significant increase in the average number of sister chromatid exchanges per lymphocyte in a cohort of subjects who received small doses of radiation . In the past, reports by Serra et al. On the inability of acute X-ray irradiation of lymphocytes to increase the frequency of SCE were unexpected. But if their findings are confirmed, then for us to understand the SCE shape