PROBLEM TO BE SOLVED: To provide a technology advantageous for improving accuracy of AEC.SOLUTION: A radiation imaging apparatus disposed in an imaging unit for acquiring a radiation image and including a plurality of detection elements for detecting an incident radiation ray further includes a dose acquisition unit. In a period in which exposure control is executed, the dose acquisition unit acquires signals from a first detection element and a second detection element of the plurality of detection elements concurrently at mutually different sampling cycles, and detects an incident radiation dose based on a first signal acquired from the first detection element and a second signal acquired from the second detection element.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】ＡＥＣの精度向上に有利な技術を提供する。【解決手段】放射線画像を取得するための撮像部に配され、入射する放射線を検出するための複数の検出素子を含む放射線撮像装置であって、放射線撮像装置は、線量取得部をさらに含み、線量取得部は、露出制御を行う期間において、複数の検出素子のうち第１検出素子および第２検出素子から、並行して互いに異なるサンプリング周期で信号を取得し、第１検出素子から取得する第１信号と、第２検出素子から取得する第２信号と、に基づいて、入射する放射線量を検出する。【選択図】図１
