Abstract
An intense optically stimulated luminescence (OSL) has been observed, for the first time, in X-irradiated copper-doped sodium chloride (NaCl:Cu) single crystals. The intensity of the OSL peak at 353 nm is proportional to the optical density of the F centres that are created by X-ray irradiation. This suggests that NaCl:Cu is useful as a material for a two-dimensional X-ray imaging sensor in computed radiography utilizing the OSL phenomenon. A possible reaction responsible for the 353 nm OSL peak is also proposed, based on the recombination of Cu 2+ ions with electrons released from the F centres.
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