PROBLEM TO BE SOLVED: To provide a radiograph image detector capable of acquiring an appropriate output electric signal even when a voltage drop occurs between both terminals of a resistor to detect a bias current amount of a photoelectric transducer and the sensitivity of the photoelectric transducer is reduced, and to provide a radiograph imaging system capable of suppressing degradation in picture quality.SOLUTION: The radiograph image detector is provided with a second amplifier circuit 72 in series with a first amplifier circuit 71 in which a read-out gain of an electric signal of a photoelectric transducer 48 is set, and acquire an appropriate output electric signal by increasing a gain of the second amplifier circuit 72 according to the reduction in the sensitivity of the photoelectric transducer 48 caused by the voltage drop.COPYRIGHT: (C)2012,JPO&INPIT【課題】光電変換素子のバイアス電流量を検出する抵抗器の両端子間に電圧降下が発生して前記光電変換素子の感度が低下した場合においても、適切な出力電気信号を得ることができる放射線画像検出装置及び画質低下が抑制された放射線画像撮影システムを提供する。【解決手段】光電変換素子48の電気信号の読み出しゲインが設定される第1増幅回路71に直列に第2増幅回路72を設け、第2増幅回路72のゲインを、前記電圧降下による光電変換素子48の感度の低下に応じて増加させることにより適切な出力電気信号を得る。【選択図】図5
