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本文以金鱼幼胚为材料研究了不同剂量和不同剂量率的60Coγ辐射对其胚胎发育的影响。结果表明,0.5~1.0Gy的辐射能加快胚胎发育的进程,但最终孵化率却很低,即超敏(HRS)现象,而2.0~4.0Gy为引起增强的辐射抗性(IRR)阶段。在相同剂量和剂量率下,处于4~8细胞期的胚胎存活率比多细胞期和囊胚早期高,而畸形率低。当以5.0Gy的剂量辐射时,剂量率小于1.0Gy/min的慢辐射对胚胎的危害大于较高剂量率(1.0~2.0Gy/min)的快辐射。
In this paper, goldfish immature embryos were used to study the effects of 60Coγ radiation with different dosages and different dose rates on embryonic development. The results showed that 0.5 ~ 1.0Gy radiation accelerated embryonic development, but the final hatching rate was very low, ie, hypersensitivity (HRS), whereas 2.0-4.0 Gy was the stage of enhanced radiation resistance (IRR). At the same dose and dose rate, the survival rate of embryos at 4 ~ 8 cell stage was higher than that at the multi-cell stage and blastocyst stage, but the rate of deformity was low. Slow radiation at a dose rate of less than 1.0 Gy / min is more harmful to embryos than fast radiation at higher dose rates (1.0-2.0 Gy / min) when irradiated at 5.0 Gy.