Phosphor, cathode-ray tube, fluorescent lamp and radiation intensifying screen

摘要

Disclosed is a phosphor suitable for use in a cathode-ray tube, a fluorescent lamp, a radiation intensifying screen, which comprises transparent spherical particles having an average particle size of 0.5 to 20 mu m and a ratio of the major diameter to the minor diameter of individual particles in the range of 1.0 to 1.5, and ultrafine particles having a diameter of 0.2 mu m less in an amount of 5 wt % or less.