CR 6-2 polycarbonate samples were irradiated using different fluences (10 11 -10 14 ions/cm 2 ) of 1 MeV protons. The structural modifications in the protonirradiated CR 6-2 samples have been studied as a function of fluence using different characterization techniques such as X-ray diffraction, intrinsic viscosity of the liquid samples, as a measure of the mean molecular mass, Fourier transform infrared spectroscopy, thermogravimetric analysis, differential thermal analysis, refractive index, color difference, and mechanical properties. The results indicate that the irradiation of CR 6-2 detector at the fluence range 1 Â 10 12 -5 Â 10 14 ions/cm 2 causes intermolecular crosslinking and allows the formation of covalent bonds between different chains, leading to a more compact structure of CR 6-2 polymer, which resulted in an improvement in its thermal, optical, and mechanical properties. Also, this crosslinking reduces the ordering structure and increases the amorphous regions that enhance the polymer resilience.