| 摘要 |
PROBLEM TO BE SOLVED: To obtain a thermosensitive material whose heat history can be measured quantitatively by a method wherein a substance which causes a chemical reaction by heat is used and a change in a fluorescent characteristic before and after its heating is detected quantitatively. SOLUTION: A chemical substance which is used as a thermosensitive material and which causes an isomer chemical reaction by heat refers to a group of substances which are represented by, e.g. anthrone, lumazine, riboflavin, anthracene amine, benzacridone, dihydroxyanthracene or the like and which induce an isomer chemical reaction by heat. In addition, it refers to a modified substance or the like which changes an original chemical structure in a range in which the isomer chemical reaction of the chemical substances is not obstructed. The concentration, in a thermosetting resin as a holding medium, of the chemical substances which cause the isomer chemical reaction by heat may be set at a concentration at which exciting light to be irradiated to detect fluorescence is transmitted into the inside of the thermosensitive material and at which fluorescence to be emitted at this time is radiated without being reabsorbed by the density extinction or the like of the thermosensitive material itself. It is preferable to use a concentration range of about 0.01 mol/g or lower with reference to the holding medium.
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