PROBLEM TO BE SOLVED: To provide a radiographic image capturing apparatus quickly detecting a start of application of radiation, and accurately detecting the radiation applied with a radiation field narrowed.SOLUTION: A control means 22 of this radiographic image capturing apparatus 1, before capturing a radiographic image, alternately and repeatedly performs a leak data dleak reading process, and a reset process of respective radiation detecting elements 7, wherein the leak data dleak reading process includes applying an OFF voltage to all scan lines 5 from a scan driving means 15, causing a read circuit 17 to read with respective switch means 8 turned off, and converting a charge q leaked from the radiation detecting elements 7 into leak data dleak via the switch means 8 and, when the read leak data dleak exceeds a threshold dleak_th, detects the start of the application of the radiation. A detecting part P is divided into a plurality of regions Pa and Pb including its central part A, and the respective regions Pa and Pb perform the leak data dleak reading process at mutually different timings.COPYRIGHT: (C)2012,JPO&INPIT【課題】放射線の照射開始を早急に検出可能で、かつ、照射野が絞られた状態で照射された放射線をも的確に検出可能な放射線画像撮影装置を提供する。【解決手段】放射線画像撮影装置1の制御手段22は、放射線画像撮影前に、走査駆動手段15から全ての走査線5にオフ電圧を印加して各スイッチ手段8をオフ状態とした状態で読み出し回路17に読み出し動作を行わせて、スイッチ手段8を介して放射線検出素子7からリークした電荷qをリークデータdleakに変換するリークデータdleakの読み出し処理と、各放射線検出素子7のリセット処理とを交互に繰り返し行わせ、読み出したリークデータdleakが閾値dleak_thを越えた時点で放射線の照射が開始されたことを検出し、検出部Pはその中央部分Aを含む複数の領域Pa、Pbに分割されており、各領域Pa、Pbで互いに異なるタイミングでリークデータdleakの読み出し処理を行う。【選択図】図7
