Rare earth-alkaline earth metal fluorohalide immunopotentiating stimulable phosphor precursor manufa

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There is provided an apparatus for preparing crystals of a phosphor precursor, comprising a reactor, a stirrer, and a supply pipe for supplying, into the reactor, a solution containing at least an aqueous solution of inorganic fluoride salt, wherein an ion concentration measuring device is provided in at least one of an interior of the reactor and a liquid contacting portion which contacts the solution containing an aqueous solution of inorganic fluoride salt.