Method of preparing barium fluoroiodide, iodine-containing barium fluorohalide phosphor, and radiation image conversion panel

摘要

A method of preparing barium fluoroiodide, an iodine-containing barium fluorohalide in which the barium fluoroiodide is used for at least one of materials thereof, and a radiation image conversion panel are provided. In the method of preparing barium fluoroiodide in a suspension preparing step, barium carbonate is added to and mixed with an aqueous solution of hydrogen iodide, such that a molar ratio of the hydrogen iodide to the barium carbonate is 0.5 to 2. A resultant solution is concentrated such that a concentration of barium iodide dissolved in the solution is at least 3.0 mol/l. Then, hydrogen fluoride is added and reacted to generate a precipitate, a rate of addition of the hydrogen fluoride being adjusted such that a molar ratio of the hydrogen fluoride to the barium carbonate added in the suspension preparing step is 0.4 to 0.8 and a theoretical amount of a precipitate of barium fluoroiodide produced during the addition of the hydrogen fluoride is 0.001 to 10 N/min wherein N is an amount of the precipitate of barium fluoroiodide which will finally be obtained. Then, the precipitate is separated.