Patent ID: 8476597

Claim:
A radiation image detecting device comprising: a radiation image detector having a plurality of pixels, each of said pixels accumulating signal charge by an amount corresponding to an amount of radiation incident from a radiation source, each of said pixels being provided with a switching element for outputting said signal charge, said outputted signal charge being converted into an electric signal; a first judgment unit for judging whether or not radiation irradiation has been started based on variation of said electric signal, said variation being detected by comparing said electric signal from at least one of said pixels with a first threshold value at predetermined time intervals; a second judgment unit for checking whether or not said variation of said electric signal is actually caused by said radiation irradiation based on fluctuation of said electric signal with time after said first judgment unit judges that said radiation irradiation has been started, to verify whether or not a judgment of said first judgment unit is correct; and a control section for controlling operation of said radiation image detector in accordance with a judgment result of said first judgment unit and a verification result of said second judgment unit.