Patent ID: 8633447

Claim:
A radiation image detecting device for imaging a sample irradiated with radiation from a radiation source to obtain a radiographic image, comprising: a plurality of pixels arranged in two dimensions along row and column directions in an imaging area, each for generating signal charge in accordance with an amount of said radiation incident on said pixel, said pixels including at least one short pixel without having a switching element for readout control of said signal charge and normal pixels having said switching element; a plurality of scan lines extending in said row direction, a gate electrode of said switching element of every normal pixel being connected to said scan line of said corresponding row; a plurality of signal lines extending in said column direction, every normal pixel being connected to said signal line of said corresponding column through a medium of said switching element, and said short pixel being directly connected to said signal line of said corresponding column; a drive section for selecting one of said scan lines, and putting said normal pixels connected to said selected scan line into charge accumulation operation and readout operation, said switching element being turned off in said charge accumulation operation to accumulate said signal charge generated in said normal pixel, said switching element being turned on in said readout operation to discharge said accumulated signal charge through said corresponding signal line; and a control section for judging a start of irradiation with said radiation and controlling said drive section, said start of said irradiation being judged based on a difference between first and second output values, said first output value being outputted from a first signal line connected to said short pixel out of said signal lines, said second output value being outputted from a second signal line connected to said normal pixel.