Radiation image detecting device and control method thereof

A control method of a radiation image detecting device, said radiation image detecting device including 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, said signal charge outputted from each of said pixels being converted into an electric signal, said control method comprising the steps of;

• judging whether or not radiation irradiation has been started by a first judgment unit 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;
• if said first judgment unit judges that said radiation irradiation has been started, starting charge accumulation operation of said radiation image detector;
• checking whether or not said variation of said electric signal is actually caused by said radiation irradiation by a second judgment unit 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 said judgment of said first judgment unit is correct;
• if said second judgment unit verifies that said judgment of said first judgment unit is correct, continuing said charge accumulation operation of said radiation image detector;
• and
• if said second judgment unit verifies that said judgment of said first judgment unit is incorrect, interrupting said charge accumulation operation of said radiation image detector, and restarting said judgment of said first judgment unit.