A casting method was used to prepare polyvinylidene fluoride (PVDF) and 1 wt % MnCl2-filled PVDF films. AgNO3 was allowed to diffuse through the filled films. The 3 types of the prepared films were irradiated by Na light with various doses. The post-irradiation and relaxation effects were investigated using ultraviolet-visible spectroscopy, X-ray analysis, and optical microscopy. The results were interpreted on the bases of a theoretical model previously suggested for a build-up and decay of radiation-induced conductivity associated with the transition of charge carriers in the presence of a uniform trap distribution. Various structures were proposed for the diffused AgNO3 before and after irradiation. It was found that the induced change in optical gap, due to 5-min irradiation time for the AgNO3 diffused films, exhibits no relaxation phenomenon. Accordingly, this film can be used in photorecording applications.