Radiation image detecting device and drive control method thereof

A radiation image detecting device, comprising:

• a plurality of pixels arranged in two dimensions, each of said pixels accumulating signal charge corresponding to an amount of radiation from a radiation source;
• a plurality of switching elements each of which is provided to correspond to each of said pixels, each of said switching element making the corresponding pixel perform a charge accumulation operation of said signal charge and a readout operation of said signal charge;
• a signal processing circuit for converting said signal charge read out from said pixels into an electric signal and outputting said electric signal;
• an irradiation detector for detecting whether irradiation of said radiation is started or not based on an electrical change on said pixels;
• a communication section that exchanges information with external devices;
• and
• a controller that stops supplying electric power to said communication section until before the start of the radiation irradiation is detected by said irradiation detector and starts supplying the electric power to said communication section when the start of the radiation irradiation is detected by said irradiation detector.