phosphor is a topic covered in the Taber's Medical Dictionary.
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(fos′fŏr, ′for″ )
[Fr. phosphore, fr L. phosphorus, morning star, fr Gr. phōsphoros, light-bringer]
A substance that in radiographic intensifying screens, fluoroscopic image intensifiers, or other image receptors converts photons of ionizing radiation into light, thereby amplifying the image.
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