| 摘要 |
PROBLEM TO BE SOLVED: To obtain a high freshly image at high sensitivity, by laminating a fluorescent substance layer and a surface protection layer on a supporter and setting the light scattering length of the surface protection layer obtained by measuring with the main light emission wavelength of the fluorescent substance of the fluorescent substance layer so as to be in a specified range. SOLUTION: The fluorescent substance layer is formed by coating and drying dispersion liquid dispersing a fluorescent substance in liquid containing binder resin. The fluorescent substance is not particularly limited, and a terbium- activated rare earth oxycarcogenite-based fluorescent substance expressed by a composition formula of d2 O2 S: Tb is preferable. The surface protection layer in which light scattering length obtained to be measured by the main light emission wavelength of the fluorescent substance in the range of 5-80μis formed on the fluorescent substance layer. The surface protection layer is formed by coating and drying dispersion liquid dispersing light scattering particles in binder containing liquid on the fluorescent substance layer. The particles of zinc oxide, zinc sulfide and the like are mentioned as light scattering particles. Fluorine contained resin, polyethylene terephthalate and polyethylene naphthalate are preferable as a binder.
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