Radiation image read-out apparatus

A radiation image read-out apparatus comprising a stimulating light beam source which projects a stimulating light beam onto a stimulable phosphor sheet storing thereon radiation image information, a photodetector which receives stimulated emission emitted upon exposure to the stimulating light beam from portions of the stimulable phosphor sheet exposed to the stimulating light beam or the back side of the sheet opposed to the portions exposed to the stimulating light beam and converts the amount of stimulated emission to an electric signal, a scanning means which moves the stimulating light beam source and the photodetector relatively to the stimulable phosphor sheet, and an image signal read-out means which reads out the output of photodetector in sequence in the respective positions in which the stimulating light beam and the photodetector are moved by the scanning means, wherein the improvement comprises that

• the photodetector comprises a CCD provided with a protective member which is permeable to light in the wavelength band of the stimulated emission and impermeable to light in the wavelength band of the stimulating light.