In this study, changes in the properties of neat, carbon and glass fiber reinforced polycarbonate via high dose rate gamma irradiation were investigated. Irradiations were carried out at dose rate of 737 Gy/h. Specimens were irradiated up to four different doses which were 10, 25, 50, 75 kGy. Total irradiation doses, irradiation dose, type and content of the additives were parameters used in estimation of radiation stability of specimens. Tensile testing, dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA), attenuated total reflectanceFourier transfor m infrared spectroscopy (ATR-FTIR), spectrophotometric analysis (for yellowness index) and scanning electron microscopy (SEM) were techniques applied for characterization of specimens. According to the results, End point criteria, which is specified for polymers used in radiated areas, were not observed in specimens by 75 kGy irradiation. Carbon fiber addition yielded more linear dependence than glass fiber regarding tensile strength values with respect to fiber content. Glass fiber and carbon fiber filled polycarbonates could be safely used in radiated areas up to a time at which total absorbed dose reaches to 75 kGy.