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The Amersham Biosciences Storage Phosphor Screen retains energy from beta particles, X-rays, and gamma rays, and requires exposure time that is 50–90% shorter than that of conventional film. Upon laser-induced stimulation, light is emitted from the storage phosphor screen in proportion to the amount of radioactivity in the sample.  The resulting digital image allows for quantitation of subtle signal intensity differences over the wide dynamic range of the system and for production of publication-quality images.  Latent images are erased with the ImageEraser, a white light source.  Screens are reusable and are not degraded by repeated exposure to laboratory levels of radioactivity.