PROBLEM TO BE SOLVED: To provide a technique advantageous for detecting the irradiation of radiation at high accuracy independently of the irradiation time of radiation to irradiate a subject.SOLUTION: A radiation imaging apparatus includes: a pixel array in which a plurality of pixels for detecting radiation are arrayed to form a plurality of rows and a plurality of columns a detection circuit which detects information correlating to a radiation dose to the pixel array and outputs a detection signal corresponding to the information and a control unit which detects radiation to the pixel array based on a plurality of integrated values obtained by integrating one of the detection signal and a result of processing applied to the detection signal in a plurality of integral intervals and controls the pixel array according to the detection.COPYRIGHT: (C)2014,JPO&INPIT【課題】照射される放射線の照射時間に拘わらずに高い精度で放射線の照射を検知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、放射線を検出する複数の画素が複数の行および複数の列を構成するように配列された画素アレイと、前記画素アレイへの放射線の照射量に相関のある情報を検知し、前記情報に対応する検知信号を出力する検知回路と、前記検知信号または前記検知信号に処理を施した結果を複数の積分区間でそれぞれ積分した複数の積分値に基づいて前記画素アレイへの放射線の照射を検知し、当該検知に応じて前記画素アレイを制御する制御部とを備える。【選択図】図8
