high in sharpness.BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is a side view showing a radiation image read-out apparatus in accordance with an embodiment of the present invention,FIG. 2 is an enlarged side view showing the detecting unit,FIGS. 3A and 3B are a plan view and a side view, respectively, showing the separator unit,FIGS. 4A to 4E are views for illustrating detection of the stimulated emiss