本文研究小鼠小肠上皮细胞分割照射时亚致死性损伤修复的特点。定量测定每次照射后修复的剂量(D_R值)。结果见到D_R的大小与照射的剂量有关。但每次照射后修复的百分比(F_R)均为50％左右。STRANDQVIST曲线指出其修复斜率为0.25。这和皮肤等组织相似。应用线性—平方概念(L-Q模式)分析了细胞生存数为20时的等效总剂量,求得小肠上皮细胞的α/β比值为10.7Gy。 This study investigated the characteristics of sub-lethal damage repair in mouse small intestinal epithelial cells. The dose (D_R value) repaired after each irradiation was quantified. The results showed that the size of D_R was related to the dose of irradiation. However, the percentage of repair (F_R) after each irradiation is about 50%. The STRANDQVIST curve indicates a repair slope of 0.25. This is similar to skin and other tissues. The linear-squared concept (L-Q mode) was used to analyze the equivalent total dose when the cell survival number was 20, and the α/β ratio of the intestinal epithelial cells was found to be 10.7 Gy.