Generally, the radiation induced conductivity (RIC) occurs when polymer materials are exposed to radiation. In the case of electron beam irradiation, it has been reported that the RIC depends on the irradiation flux and the trap distribution created by the irradiation in the material. Recently, the number of satellites operated in environments where high-energy protons ($\mathrm{H}^{+}$) exist is increasing. However, the mechanism of RIC in the case of $\mathrm{H}^{+}$ irradiation has not been clarified, yet. Therefore, in this study, the space charge distribution was measured using the PEA method under proton beam irradiation. The trap depth was calculated from the charge accumulation decay curve to investigate the relationship between the generated trap and charge accumulation. As a result, it was observed that the trap depth increased, and the amount of charge accumulation increased as the irradiation dose rate increased.