Polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP) were firstly dissolved in distilled water of 90℃, and then mixed with citosan and glycerin by mechanical stirrer at room temperature. The PVA:PVP ratio was about 6:4, the mass fraction of chitosan and glycerin were both of 3 %. After being kept at room temperature for 3 h to remove air bubble, the obtained PVA/PVP/glycerin/chitosan water mixtures (hydrogels) were irradiated at room temperature with 1 MeV electron beam. The electron beam irradiations were performed on the Electron Beam Accelerator of Institute of Modern Physics, Chinese Academy of Sciences. The irradiation doses are in the range from 10 to 100 kGy.
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