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小鼠经梯度剂量的裂变中子和６０Ｃｏγ射线照射后１ｄ，其胸腺细胞数和胸腺重量指数的变化，都显示了对中子和γ射线有辐射敏感和辐射抗性两种成分的存在，而同一种成分对中子辐射的敏感性又高于对γ射线的辐射敏感性。对中子辐射敏感成分的Ｄ０值依次为０．６４和０．３４Ｇｙ，对γ射线的Ｄ０值则相应为０．８３和０．８７Ｇｙ。ＲＢＥ值分别为１．３０和２．５６。照射后小鼠胸腺Ｔ细胞亚群的变化表明，两种Ｔ细胞亚群的辐射敏感性也是非均质性的，粗略评价，对中子和γ射线的辐射敏感性均是Ｌｙｔ＋２细胞高于Ｌ３Ｔ４＋细胞，而两类细胞对中子的辐射敏感性又均高于对γ射线的辐射敏感性，经计算各类细胞对中子照射的Ｄ３７值，Ｌ３Ｔ４＋细胞为６．１４Ｇｙ，Ｌｙｔ＋２细胞为３．２８Ｇｙ；对γ射线则分别为１１．３８和１０．４２Ｇｙ，由此得到的ＲＢＥ值分别为１．８５和３．１８。
The changes of thymus number and thymus weight index of mice induced by gradient doses of fission neutrons and 1 day after 60Coγ-ray irradiation showed the existence of both radiation-sensitive and radiation-resistant components for neutron and γ-rays The same composition is more sensitive to neutron radiation than to gamma radiation. The D0 values for the neutron-sensitive components were 0.64 and 0.34 Gy, respectively, and the D0 values for gamma rays were 0.83 and 0.87 Gy respectively. RBE values were 1.30 and 2.56, respectively. The changes of T lymphocyte subsets in mouse thymocytes after irradiation showed that the radiation sensitivity of the two T cell subsets was also heterogeneous. Roughly evaluated, the radiation sensitivity of neutrons and γ-rays to Lyt + 2 cells was higher than that of L3T4 + However, the radiation sensitivity of neutrons to both types of cells was also higher than that of γ-rays. The D37 values of neutrons were calculated for all kinds of cells, which were 6.14 Gy for L3T4 + cells and 3 for Lyt + 2 cells. 28Gy for gamma rays and 11.38 and 10.42Gy for gamma rays, respectively, resulting in RBE values of 1.85 and 3.18, respectively.