Patent ID: 9496061
Filing Date: 2016-11-15
CPC Classification: G01T,G21K

Claim Text:
1. A radiographic image conversion panel comprising a photoelectric conversion element and a scintillator layer including a phosphor and one or more activators, the phosphor being in the form of columnar crystal, the activator concentration in the thickness direction of the scintillator layer giving a profile curve having two or more peaks, wherein the profile curve of the activator concentration is prepared by showing the activator concentrations in every 100 μm thick region in the thickness direction of scintillator layer as bars along a vertical axis on a bar graph versus the locations of the thickness in the scintillator layer as a horizontal axis, and by connecting the middle points of the bars, the resulting profile curve has peaks of activator concentration at both a root portion side of the columnar crystal and in an end portion side opposite to the root portion side, the root portion side being a region extending over a thickness of 100 μm from a first principal surface of the scintillator layer, the first principal surface is a starting point of the growth of columnar crystal, and the end portion side being a region extending over a thickness of 100 μm from a second principal surface of the scintillator layer, the second principal surface is the surface opposite to the first principal surface, and the amount of activator or activators present in a region of the scintillator layer extending over a thickness of 100 μm from the first principal surface of the scintillator layer opposed to the photoelectric conversion element being 0.3 to 0.7 mol % (relative to the amount of phosphor base compound present in the region taken as 100 mol %).