Patent ID: 6440587
Filing Date: 2002-08-27
Classification: C09K,G21K,Y10T

Abstract:
An image receptive phosphor screen, comprising:(a) an infrared-absorbing substrate; and (b) a phosphor layer coated on said substrate, wherein said phosphor layer comprises a phosphor powder composition comprising a dopant accepting base comprising at least one element selected from amongst those of groups IIA to VIA of the Periodic Table, about 0.0025 to 0.1 weight percent of a first dopant comprising a source of samarium, and about 0.0025 to 0.2 weight percent of a second dopant comprising a source of cerium; wherein said phosphor powder has a narrow particle size distribution and an average particle size, measured in its long dimension, of greater than 0 up to less than about 5 microns; and wherein said image receptive screen is fast scannable as a result of said phosphor powder being of small particle size, having low dopant proportions and having been reactivated by mild heating at a temperature of less than about 550Â° C. after a sinter of said phosphor powder composition has been comminuted under conditions sufficient to at least partially deactivate the phosphor.