In a solid state radiation detector, an electrode layer, to which an electromagnetic wave for retrieval is irradiated, is formed by alternately arranging a first stripe electrode for transmitting the electromagnetic wave for retrieval and a second stripe electrode for shielding the same. Upon recording a radiation image, discharge breakdown of the first and the second stripe electrodes owing to application of a direct-current voltage is avoided. Upon recording a radiation image with the solid state radiation detector, when the direct-current voltage is applied between a first electrode layer and either the first stripe electrode or the second stripe electrode, leading and trailing edges of the direct-current voltage has variation with time, thus reducing electric currents flowing on the stripe electrodes, and a potential difference between an open end portion of each stripe electrode and either the first or the second stripe electrode adjacent thereto.