| abstract |
Provided is an excellent photochromic composition as a material for a radiation indicator that can easily detect radiation with high sensitivity and can quantitatively measure how much radiation is emitted. To do. In a photochromic composition containing a phosphor that emits light upon irradiation, a photochromic compound, and a binder resin, the content of the photochromic compound in the total solid content of the photochromic composition is 10% by weight or more, In addition, the weight ratio of the light emitter to the photochromic compound is set to be 8 times or less. [Selection figure] None |