Abstract
Thin polystyrene films are irradiated with protons (3MeV) under vacuum at room temperature with the absorbed dose ranging from 2 × 106 to 2 × 107 Gy. The changes in color, increase of cross-linking, and induction of microstrain on the surface of proton-irradiated polystyrene are investigated with UV-VIS, Fourier transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD) techniques, respectively. There are minimal changes in these properties up to 6 × 106 Gy, which is much more than the 25kGy radiations needed for sterilization.
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