PROBLEM TO BE SOLVED: To provide a technique that more accurately detects an amount of radioactive ray to be incident upon a radioactive ray imaging device.SOLUTION: A radioactive ray imaging device includes: a plurality of first pixels that is arranged in an imaging area for acquiring a radioactive ray image； a second pixel for acquiring an amount of radioactive ray to be incident during irradiation of a radioactive ray； and a control unit that controls the plurality of first pixels and the second pixel. The control unit is configured to: cause an electric charge in accordance with the amount of radioactive ray to be stored in the plurality of first pixels； acquire the incident amount of radioactive ray for each detection cycle, while causing the second pixel to operate at the detection cycle of the radioactive ray determined based on irradiation information on the radioactive ray prior to the irradiation of the radioactive ray； correct the acquired amount of radioactive ray according to an amount of noise of the noise output by the second pixel operating at the detection cycle； cause the irradiation of the radioactive ray to be suspended on the basis of a storage amount of a post-corrected amount of radioactive ray； and read the electric charge stored in the plurality of first pixels after the irradiation of the radioactive ray.SELECTED DRAWING: Figure 1【課題】放射線撮像装置に入射する放射線量を、より高い精度で検出する技術を提供する。【解決手段】放射線画像を取得するために撮像領域に配された複数の第１の画素と、入射する放射線量を放射線の照射中に取得するための第２の画素と、複数の第１の画素及び第２の画素を制御する制御部と、を含み、制御部は、複数の第１の画素に放射線量に応じた電荷を蓄積させるとともに、放射線の照射前に放射線の照射情報に基づいて決定した放射線の検出周期で第２の画素を動作させながら、入射した放射線量を検出周期ごとに取得し、検出周期で動作する第２の画素が出力するノイズのノイズ量に従って、取得した放射線量を補正し、補正後の放射線量の累計値に基づいて放射線の照射を停止させ、放射線の照射後に、複数の第１の画素に蓄積された電荷を読み出す。【選択図】図１
