PROBLEM TO BE SOLVED: To provide a method for producing a fluorescent material for a scintillator having improved light emission intensity.SOLUTION: The method for producing the fluorescent material in a garnet structure using Ce as a light-emitting element, and containing Gd, Ga, Al and O includes a temperature-raising step of raising the temperature of a molded article, a sintering step of sintering the molded article at a temperature within the range of 1,300-1,700°C, and a temperature-decreasing step of decreasing the temperature of the sintered body after the sintering. The temperature-decreasing step is controlled so that the decrease of the temperature is started at a temperature-decreasing rate of 75-300°C/h. Preferably, the temperature-decreasing step is carried out by decreasing the temperature at the first temperature-decreasing rate of 75-300°C/h, and further decreasing the temperature by changing the temperature-decreasing rate to the second temperature-decreasing rate more rapid than the first temperature-decreasing rate in the midway of the decrease of the temperature.COPYRIGHT: (C)2012,JPO&INPIT【課題】 発光強度を向上したシンチレータ用蛍光材料を得るための製造方法を提供する。【解決手段】 Ceを発光元素とし、Gd、Ga、Al、Oを含有するガーネット構造の蛍光材料の製造方法であって、成形体の温度を上げる昇温工程と、前記成形体を1300~1700℃の範囲内の温度で焼結する焼結工程と、焼結後に焼結体の温度を下げる降温工程とを有し、前記降温工程は、75~300℃/hの降温速度で降温を開始するように制御する。前記降温工程は、75~300℃/hである第1の降温速度で温度を下げ、降温の途中に、前記第1の降温速度よりも速い第2の降温速度に変えて温度を下げることがより望ましい。【選択図】 図1
