A mammographic system as a radiation image capturing apparatus includes a radiation source for emitting radiation, a solid-state detector for detecting radiation emitted from the radiation source and generating a radiation image based on such radiation, AEC sensors for detecting a radiation dose emitted from the radiation source, a radiation source controller for controlling the dose emitted from the radiation source based on output signals from the AEC sensors, a reference output storage unit for storing reference output ranges defining respective ranges of reference output signals for the solid-state detector and the AEC sensors, and a malfunction detector for comparing output signals generated by the solid-state detector and the AEC sensors with the respective reference output ranges to detect a malfunction of the solid-state detector, the AEC sensors, or the radiation source.