An image detection apparatus that utilizes a flat panel detector is widely used in x-ray digital imaging to generate digital image data. The flat panel detector includes a scintillator for generating fluorescence when exposed to radiation and a pixel array for detecting the fluorescence of the scintillator. The scintillator and the pixel array are disposed on, for example, individual substrates, respectively, and are bonded to each other through an adhesive layer. The radiation is converted into light by the scintillator and the fluorescence of the scintillator is converted into an electrical signal by the pixel array, and, as a result, digital image data is generated.