Abstract

Color centers with absorption bands in the near infrared region (peaking near 900 nm) in X-rayed MFX crystals have been found. They might be attributed to the aggregates of F(X-) centers which are similar to M centers in MX crystals. The interconversion among F(F-), F(Br-), and M centers in BaFBr crystals has been found. These aggregated color centers are stable and exhibit stimulable absorption bands in the region from 700 to 1000 nm. Therefore some solid state lasers can be used as stimulating light sources instead of He-Ne lasers for reading the information stored in PSL image plates made of these X-ray storage phosphors.

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