PROBLEM TO BE SOLVED: To provide a radiation image photographing device capable of properly detecting start of emission of radiation by the device itself and capable of reducing power consumption in a reading process before photographing.SOLUTION: Control means 22 of a radiation image photographing device 1 repeats in alternate manner, before radiation image photographing, a leak data dleak reading process in which a reading circuit 17 is caused to perform reading operation under such a condition as an off voltage is applied to all scan line 5 from scan drive means 15 so that all switch means 8 come to be in off state, and an electric charge q leaked from a radiation detection element 7 through switch means 8 is converted to leak data dleak, and a reset process of each radiation detection element 7, so as to detect that emission of radiation has been started when the leak data dleak that has been read exceeds a threshold value dleak_th. The reset process of each radiation detection element 7 which is alternately performed with the leak data dleak reading process before radiation image photographing is periodically suspended.COPYRIGHT: (C)2012,JPO&INPIT【課題】装置自体で放射線の照射開始を的確に検出可能で、かつ、撮影前の読み出し処理における電力消費を低減することが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するとともに、放射線画像撮影前のリークデータdleakの読み出し処理と交互に行う各放射線検出素子7のリセット処理を定期的に中止する。【選択図】図7
