A process for reading a radiation image out of a radiation image storage panel which has a phosphor layer comprising columnar crystals of europium activated cesium halide stimulable phosphor in which a radiation image is recorded, is performed by the steps of: exposing the storage panel to stimulating light in a stimulating energy of 2 to 10 J/m.sup.2; photoelectrically collecting a stimulated emission given off from the storage panel; and converting the collected emission into a radiation image in the form of a series of electric image signals.