PROBLEM TO BE SOLVED: To provide an X-ray image photographing device capable of precisely photographing the beginning of X-ray radiation without false detection.SOLUTION: The present invention is an X-ray image photographing device 1 for taking a picture with a non-coordination scheme in which signals are not transmitted and received to and from an X-ray generation device that radiates an X-ray, wherein the X-ray image photographing device 1 includes a plurality of detection elements 20 arrayed in two-dimensional form, and the detection elements 20 used are a photo-counting type detection element 20 that counts the number N of photons of an incident X-ray, or the number N of photons of an electromagnetic wave converted from the incident X-ray by a scintillator and entering the detection element 20.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2016,JPO&INPIT【課題】Ｘ線の照射開始を誤検出することなく的確に撮影を行うことが可能なＸ線画像撮影装置を提供する。【解決手段】Ｘ線を照射するＸ線発生装置との間で信号の送受信を行わない非連携方式で撮影を行うＸ線画像撮影装置１において、二次元状に配列された複数の検出素子２０を備え、検出素子２０として、入射したＸ線の光子の個数Ｎ、または入射したＸ線がシンチレーターで変換されて当該検出素子２０に入射した電磁波の光子の個数Ｎをカウントするフォトカウンティング方式の検出素子２０が用いられている。【選択図】図３
