A radiation conversion panel allows recorded radiation image information to be read therefrom with high accuracy while reliably avoiding adverse effects of residual past radiation image information that remains in the radiation conversion panel. When a radiation conversion panel storing radiation image information therein is scanned by reading light from a reading light source, the radiation image information is read from first linear electrode layers, and scanned position information is read from a first linear electrode layer of a marker. A corrector corrects presently read radiation image information based on past radiation image information and scanned position information to acquire radiation image information free from the effect of a residue of the past radiation image information.