▎ 摘　　要

In this experimental study, graphene oxide (GO) nanopowder was prepared and irradiated by the Co-60 gamma -rays in different absorbed doses of 0, 10, 30, 50, 80, 100, 120 and 150 kGy at dose rate of 1.62 Gy s(-1) at room temperature. Field emission scanning electron microscope and high-resolution transmission electron microscopy analyses were used to investigate structural defects in GO material. Then, using Raman spectroscopy, the ratio of I-D/I-G related to D- and G-bands in the wavenumbers of 1350 and 1586 cm(-1) was, respectively, measured in terms of absorbed dose to determine the dose-response of GO material. The results showed that the dose-response of gamma -irradiated samples at the dose range of 0-50 kGy was linear. There was a decline in dose-response after 100 kGy due to graphitization of carbon nanostructure material or annealing the defects in the sample. The results of this study showed that the linearity response of gamma -irradiated GO as a novel passive dosimeter is suitable for the dosimetry of gamma -rays at the radiation processing level.