二价铕激活的氟氯化钡的合成反应机理及其在X线照像增感屏中的应用

二价铕激活的氟氯化钡是一种高效率的X射线发光材料。Stevels和Pingault[1]曾研究过BaFCl:Eu2+在X射线激发下的发光性质。E.I.Du Pont公司用BaFCl:Eu2+制成X射线照像用增感屏[2]。

THE REACTION MECHANISM OF SYNTHESIS OF DIVALENT EUROPIUM ACTIVATED BARIUM LUORIDE CHLORIDE AND ITS APPLICATION IN MEDICAL X-RAY INTENSIFYING SCREENS

A rather simple process for preparing BaFCl:Eu phosphor of contral-lable particle size has beend developed.Refering to the phase diagram of BaCl2-BaF2-H2O system,the matrix compound BaFCl was synthesized by "homogeneous" precipitation. BaFCl thus obtained is tiny crystallite with a mean size smaller than 0.5μm EuCl3 and KC1 were added to the BaFCl and heated in air to form the Eu2+ doped phosphor.The reaction mechanism of thermal reduction decomposition of EuCl3 in pure state and in the system of BaFCl-EuCl3 has been studied by equilibrium vapour pressure measurement and solid phase composition and structure determination.X-ray intensifying screens for diagnostic radiography made with this phosphor exhibit a purple-blue emission spectrum being enveloped by the sensitivity curve of the conventional blue sensitive film and have a high speed and good image quality.