分析了紫外光照射下毛竹自由基的变化规律和表面化学组成及结构的变化.利用电子自旋共振波谱和X射线光电子能谱技术，分别测量紫外光辐照后毛竹颗粒的自由基波谱和X射线光电子能谱.结果表明:毛竹自由基的光谱分裂因子g=2.003 3，自由基的强度随着辐照时间按Y=1－e－biPt规律增加；紫外光照60 min后毛竹表面O/C原子比稍有增加,C-C和C-H含量增加，C-O和C=O含量减少，-O-C=O含量增加为原来的3倍左右，说明毛竹表面生成了一些含氧官能团或碳的氧化态增高.

Changes of the free radical and chemical components and structures of the moso bamboo irradiated with UV-B are analyzed. Electron spin resonance (ESR) and X-ray photoelectron spectroscopy (XPS) are used to measure the spectrum of the free radicals and the X-ray photoelectron spectroscopy of the UV-B-irradiated bamboo powder. The testing results reveal that when the spectral splitting factor of the bamboo free radicals (g) is 2.003 3, the intensity of free radicals increases with the irradiation time according to the law: Y=1－e－biPt; after 60 mins of irradiation with UV-B, the O/C atomic ratio in the surface bamboo increases slightly; C-C and C-H contents increase; C-O and C=O contents decrease; -O-C=O contents increase to about 3 times than the original one, which indicate in the moso bamboo surface some oxygen-containing functional groups occurr and carbon oxidation state increased.