PROBLEM TO BE SOLVED: To provide a radiation image photographing device capable of promptly removing a rag generated by the irradiation of radiation from a radiation detecting element.SOLUTION: A radiation image photographing device 1 comprises a plurality of radiation detecting elements 7 two-dimensionally aligned on a detecting portion P, a bias power supply 14 for applying bias voltage Vbias on each radiation detecting element 7, and controlling means 22 for controlling the bias voltage Vbias applied on each radiation detecting element 7 from at least the bias power supply 14. The controlling means 22 varies the bias voltage Vbias applied on each radiation detecting element 7 during the reset processing of each radiation detecting element 7 to be lower than bias voltage Vbias0 applied on each radiation detecting element 7 during read-out processing of image data D for reading out the image data D from at least each radiation detecting element 7.COPYRIGHT: (C)2012,JPO&INPIT【課題】放射線の照射により発生するラグを放射線検出素子内から速やかに除去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は、検出部P上に二次元状に配列された複数の放射線検出素子7と、各放射線検出素子7にバイアス電圧Vbiasを印加するバイアス電源14と、少なくともバイアス電源14から各放射線検出素子7に印加するバイアス電圧Vbiasを制御する制御手段22を備え、制御手段22は、各放射線検出素子7のリセット処理の際に各放射線検出素子7に印加するバイアス電圧Vbiasを、少なくとも各放射線検出素子7から画像データDを読み出す画像データDの読み出し処理の際に各放射線検出素子7に印加するバイアス電圧Vbias0よりも低い電圧に可変させる。【選択図】図8
