| 摘要 |
PROBLEM TO BE SOLVED: To make easily and accurately displayable the radiation dose by providing a discolored layer where a coloring electron-donor organic compound and an active species generation organic compound contain a hydrophilic compound and a radiation sensitizer on the surface of a base sheet. SOLUTION: The disoclored layer 1 where a coloring electron-donor organic compound and an active species generation organic compound for coloring the electron donor organic compound contain a hydrophilic compound, and a radiation sensitizer is provided at least one portion of the surface of a base sheet 2. A coloring matter 3 that is approximated to hue before or after the discoloration of the discolored layer 1 may be provided at one portion on the discolored layer 1. Triphenylphthalide, fluorene, phenothiazine, or the like are used for the coloring electron-donor organic compound, and carbon tetrabromide, tribromoethanol, tribromomethyphenylsulfone, or the like are used for the active species generation organic compound. A macromolecule, an organic low-molecule compound, anion/cation surface-active agents, or the like are used for a hydrophilic compound.
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