PROBLEM TO BE SOLVED: To enable a user to acquire the presence or absence of calibration operation in regard to characteristics of a radiation detecting part.SOLUTION: This radiation image imaging system has a radiation detecting part 1015 including a phosphor 1012 for converting incident radiation into light, and a photoelectric conversion part 1013 for converting the light converted by the phosphor 1012, into an electric signal by a plurality of pixels to image a radiation image a planar light emitter 1014 illuminating the plurality of pixels in the photoelectric conversion part 1013 an illumination image acquiring part 107 for acquiring an illumination image imaged by the photoelectric conversion part 1013 based on the light emitted by the planar light emitter 1014 an illumination image comparing part 110 for comparing at least two illumination images acquired at different timing in the illumination image acquiring part 107 and a characteristic determining part 111 for determining whether the characteristics of the radiation detecting part 1015 have changed based on the compared result of the illumination image comparing part 110.COPYRIGHT: (C)2010,JPO&INPIT【課題】放射線検出部の特性に対する較正作業の有無を使用者が把握できるようにする。【解決手段】入射した放射線を光に変換する蛍光体1012と、蛍光体1012で変換された光を複数の画素で電気信号に変換して放射線画像の撮像を行う光電変換部1013とを含む放射線検出部1015と、光電変換部1013の複数の画素を照明する面状発光体1014と、面状発光体1014によって照明された光に基づいて光電変換部1013で撮像された照明画像を取得する照明画像取得部107と、照明画像取得部107において異なるタイミングで取得された少なくとも2つの照明画像を比較する照明画像比較部110と、照明画像比較部110による比較の結果に基づいて、放射線検出部1015の特性が変化したか否かを判断する特性判断部111を有する。【選択図】図1
