| 摘要 |
A divalent metal fluorohalide phosphor having a compositional formula: (Ba1-x,M<II>x)F2.aBaX2:yEu,zB (wherein, M<II> is at least one member selected from the group consisting of beryllium, magnesium, calcium, strontium, zinc, and cadmium, X is at least one member selected from the group consisting of chlorine, bromine, and iodine, and a, x, y, and z are numbers satisfying the respective conditions 0.5</=a</=1.25, 0</=x</=1, 10<-><6></=y</=2x10 <1>, and 0<z</=2x10 <1>, that when exposed to and allowed to absorb radiation or ionizing radiation, and subsequently excited with a light of 450 to 800nm of tube wave length, provides stimulated emission of light with heretofore unattainable high luminance. A radiation image storage panel is produced by depositing on a support a phosphor layer formed of the afore referred to phosphor.
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