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~(60)Coγ射线对天宝香蕉试管芽的辐照试验结果表明：供试试管芽材料因大小不同对~(60)Coγ射线所表现的敏感性有明显的差异．其中以2．0-5．0mml／2纵切芽体最敏感，其次是2．0-5．0mm芽，而5．0～10．0mm芽最不敏感，它们的半致死剂量（LD_(50)）分别是49．299Gy、57．431Gy和68．191Gy。~(60)Coγ射线对供试试管芽的生长量和芽增殖数有明显的影响，其严重度与剂量水平成负相关。它们的相关系数（r）分别为-0．879，-0．906。
Irradiation experiments of ~ (60) Coγ-ray on the tube shoots of Tianbao showed that there were obvious differences in sensitivity of ~ (60) Coγ-ray to test tube shoots due to different sizes. Among them, 2.0-5.0mml / 2 was the most sensitive to the longitudinal cut buds, followed by 2.0-5.0mm buds, while the 5.0 ~ 10.0mm buds were the least sensitive, and their LD50 (LD_ 50)) are 49.299Gy, 57.431Gy and 68.191Gy, respectively. The effect of ~ (60) Coγ-ray on the growth of shoots and bud multiplication of test tube had obvious effect, and its severity was negatively correlated with the dose level. Their correlation coefficients (r) were -0.879, -0.906 respectively.