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木材经γ辐照后，高聚物分子的共价键断裂而产生自用基。主谱ｇ０＝２．０１９３的自由基随辐射剂量Ｄ按指数率Ｙ＝１－ｅ~（ａａＤ）规律增长，最后趋于饱和。辐射引发自由基强度与树种有关。机械自由基强度大的木屑，辐射引发自由基强度也大。
After gamma irradiation of the wood, the covalent bonds of the polymer molecules break to give self-supporting groups. The main spectrum g0 = 2.0193 free radicals with the radiation dose D according to the exponential rate of Y = 1-e aaD law of growth, and finally tends to saturation. Radiation-induced free radical intensity is related to tree species. Mechanical strength of the large free radicals, radiation-induced free radical strength is also large.