A scintillator-photosensor sandwich is generated by gluing a first support frame onto an adhesive layer (covered with a protective film on the side facing the adhesive layer, the first frame having a size that (in terms of area) surrounds the scintillator-photosensor sandwich to be produced. The first support frame is placed onto a flat base that supports a first function layer (either a scintillator layer or a photosensor layer). The adhesive layer supported on the first support frame and the first function layer are laminarly assembled. The protective film is removed from the adhesive layer and a second function layer (the other of the scintillator layer or the photosensor layer not used as the first function layer) is assembled with the first function layer with the interposed adhesive layer.