Patent ID: 7291844

Claim:
An X-ray radiation detector comprising: a plurality of detection cells arranged along a detection plane of the X-ray; each of said plurality of detector cells having respectively a scintillator unit comprised of a scintillator, and a photoelectric transducer element provided laminatedly in said scintillator unit for transducing the light from said scintillator unit to electric signals; said scintillator units in said plurality of detector cells being mutually partitioned by a border having a groove extending along said detection plane; and said groove being formed to a depth for leaving the scintillator at said border, wherein the depth of said groove is determined such that a thickness of the scintillator left on said border is equal to or less than half of a thickness of said scintillator unit, and wherein the depth of said groove is determined such that an X-ray of a rate of more than a half of a predetermined rate from within the X-ray incident to the scintillator left on said border transduces to light.