Patent ID: 7893405
Filing Date: 2011-02-22
Classification: G01T

Abstract:
1. A radiation detection apparatus, comprising: an optical detector having a substrate and a plurality of photoelectric conversion elements arranged, on the substrate, for converting incident light into an electric signal; and a scintillator layer disposed on the optical detector and having a columnar crystal structure which converts radiation into light, wherein the scintillator layer contains a first material and an activator, and the concentration of the activator in the scintillator layer varies in the first material of the scintillator layer, wherein the scintillator layer comprises at least two vertical regions, wherein the columnar crystal structure comprises a plurality of columnar crystals each corresponding to each of the plurality of photoelectric conversion elements, and wherein the concentration of the activator in the scintillator layer is not less than 0.7 mol % at the radiation-incident side, and is higher than the concentration in the scintillator layer at the optical detector side.