Lighting of radiation is detected without taking the interface of the radiation generator, at the same time, the case of radiation image photographing the consumption of electricity the decrease possible portability die radiation image photographing device is offered. The device the electric current detection means reading out the electric charge which is generated inside 42 which detect the electric current which flows and each image pickup component 7 in the portability die radiation image photographing device 1 where multiple image pickup components 7 are arrayed into two dimensional condition, it does not do power supply mode and the read-out of electric charge are in a state where it is possible to convert to the electric information, and power supply mode compared to low when the read-out circuit 17 which possesses the queued mode of dissipation power and the read-out circuit 17 is had to queued mode, detecting the start of lighting of radiation due to the fact that the electric current tonnage which is detected by electric current detection means 42 augmentsWhen it does, it reads out and the circuit 17 it has with the control means 22 from queued mode succession to power supply mode.放射線発生装置とのインターフェースをとることなく放射線の照射を検出し、かつ、放射線画像撮影の際の電力の消費量を低減可能な可搬型放射線画像撮影装置を提供する。複数の撮像素子7が二次元状に配列された可搬型放射線画像撮影装置1において、装置を流れる電流を検出する電流検出手段42と、各撮像素子7内で発生した電荷を読み出して電気信号に変換することが可能な状態である電力供給モードと、電荷の読み出しを行わず電力供給モードよりも低消費電力の待機モードとを有する読み出し回路17と、読み出し回路17が待機モードにある状態で、電流検出手段42により検出される電流量が増加したことにより放射線の照射開始を検出すると、読み出し回路17を待機モードから電力供給モードに遷移させる制御手段22とを備える。
