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Rare earth-alkaline earth metal fluorohalide stimulable phosphor particles and method of forming a r

2025-06-20 10:072880下载
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PROBLEM TO BE SOLVED : To obtain particles for a radiation image conversion panel having a high clarity, a high luminance, and a high particle fineness by carrying out the surface treatment of fired phosphor particles with a silane coupling agent in the presence of metal oxide particles having a specified mean particle diameter by a wet process under high-speed agitation. SOLUTION : Synthesized stimulable phosphor particles are fired, 0.01-10 wt.%, based on the phosphor particles, metal oxide particles, such as of Al2O3 or SiO2, having a mean particle diameter of 2-50 nm and 0.1-5 wt.% silane coupling agent such as &gamma -mercaptopropyltrimethoxysilane are added to the fired particles, and the resulting mixture is wet-treated under high-speed agitation of at least 5/sec peripheral speed to obtain a rare-earth-activated alkaline earth metal fluorohalide stimulable phosphor represented by the formula : Ba1-XM2XFX : yM1.zLn and having a mean particle diameter of 1-10 &mu m. In the formula, M2 is Mg, Ca, Sr, or the like; M1 is Li, Na, K, Rb, or the like; X is Cl, Br, or I; Ln is Ce, Pr, Sm, Eu, or the like; 0<=x<=0.6; 0<=y<=0.05; and 0
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