PROBLEM TO BE SOLVED: To provide a technique advantageous for monitoring irradiation of a radiation with high responsibility while suppressing increase in the array pitch of pixels or reduction in sensitivity of the pixels.SOLUTION: A radiation imaging apparatus includes a plurality of pixels arrayed in an imaging area so as to constitute a plurality of rows and a plurality of columns. The plurality of pixels include a plurality of imaging pixels for acquiring a radiation image and a detection pixel for detecting a radiation. The radiation imaging apparatus further includes a column signal line and a detection signal line. The imaging pixel includes a first conversion element which converts the radiation into an electric signal and a first switch which is arranged between the first conversion element and the column signal line. The detection pixel includes a second conversion element which converts the radiation into an electric signal and a second switch which is arranged between the second conversion element and the detection signal line.【課題】画素の配列ピッチの増大あるいは画素の感度の低下を抑えながら放射線の照射を高い応答性でモニターするために有利な技術を提供する。【解決手段】放射線撮像装置は、複数の行および複数の列を構成するように撮像領域に配列された複数の画素を有し、前記複数の画素が、放射線画像の取得のための複数の撮像画素と、放射線の検知のための検知画素とを含む。放射線撮像装置は、更に、列信号線および検知信号線を備える。前記撮像画素は、放射線を電気信号に変換する第１変換素子と、前記第１変換素子と前記列信号線との間に配置された第１スイッチとを含む。前記検知画素は、放射線を電気信号に変換する第２変換素子と、前記第２変換素子と前記検知信号線との間に配置された第２スイッチとを含む。【選択図】図１
