Thermofluorescent stack, thermofluorescent plate, process for producing thermoflorescent stack, process for producing thermofluorescent plate, and method of acquiring three-dimensional radiation dose distribution

Provided are a dosimeter which is based on thermofluorescent plates and with which a three-dimensional radiation dose distribution can be acquired, a process for producing the dosimeter, and a method of using the dosimeter. A thermofluorescent stack (11) is composed of a plurality of stacked thermofluorescent plates (13), the thermofluorescent plates (13) being constituted of a thermofluorescent substance containing no aluminum(III) and a heat-resistant resin.  The thermofluorescent substance comprises lithium tetraborate as a base and manganese contained as a fluorescent center in the base.