Patent Number: 
Section: claims

1. A scintillator panel comprising:a substrate portion having a first main surface and a first rear surface intersecting a first direction on sides opposite to each other, and a first side surface extending such that the first main surface and the first rear surface are joined to each other;a scintillator layer portion having a second rear surface formed of a plurality of columnar crystals extending in the first direction and formed to include a base portion being on one end side of the columnar crystals and facing the first main surface, a second main surface formed to include a tip portion on the other end side of the columnar crystals, and a second side surface extending such that the second main surface and the second rear surface are joined to each other; anda barrier layer formed to come into contact with each of the first main surface in the substrate portion and the second rear surface in the scintillator layer portion,wherein the first side surface and the second side surface are substantially flush with each other,wherein in the substrate portion, an angle between the first rear surface and the first side surface is smaller than 90 degrees,wherein the barrier layer is formed fo thallium iodide, andwherein the scintillator portion is made of a material having cesium iodide as a main component. 2. The scintillator panel according to claim 1,wherein the scintillator layer portion generates scintillation light, andwherein the substrate portion absorbs the scintillation light. 3. The scintillator panel according to claim 1,wherein the scintillator layer portion generates scintillation light, andwherein the substrate portion reflects the scintillation light. 4. The scintillator panel according to claim 1,wherein the substrate portion is formed of polyethylene terephthalate. 5. The scintillator panel according to claim 1,wherein the second rear surface of the scintillator layer portion comes into contact with the first main surface of the substrate portion. 6. A radiation detector comprising:a scintillator panel according to claim 1 emitting scintillation light in response to incident radiation; anda photo-detection substrate facing the scintillator panel and detecting the scintillation light.