A scintillator panel includes: a flexible substrate; a phosphor arranged on the flexible substrate; and a thermal expansion compensation layer disposed between the flexible substrate and the phosphor, wherein a linear expansion coefficient of the thermal expansion compensation layer is greater than a thermal expansion coefficient of the phosphor, and surfaces, of the thermal expansion compensation layer and of the flexible substrate, in contact with each other each contain an organic substance.

Provided is a scintillator panel with reduced deterioration in brightness due to irradiation and higher brightness. A scintillator panel including a substrate and a scintillator layer containing phosphors, in which the scintillator layer includes a binder resin having a -conjugated structure composed of seven or more atoms; in which the glass transition temperature of the binder resin is from 30 to 430 C.; and the thickness of the scintillator layer is from 50 to 800 m.

The present invention relates to a method for forming an optical waveguide sensor for detecting ions containing radioactive isotopes in an aqueous solution. The method comprises treating a substrate surface by cleaning the substrate surface with one or more solvents to enable coating with a crosslinking agent, the substrate being selected from silica or silicon substrate, coating the treated substrate surface with the crosslinking agent selected from carboxylic acid functional group containing organic molecules to form a crosslinked substrate surface, coating the crosslinked substrate surface with a scintillating agent, and coating the substrate surface with a ligand capable of reacting with a radioactive isotope in an aqueous solution to form a functionalized substrate surface. The present invention also relates to the optical waveguide sensor for detecting radioactive isotopes fabricated with the method of the present invention.