Patent ID: 7501631

Claim:
A radiation detector, comprising: a semiconductor substrate incorporating dopants of a first conductivity type; a scintillator that converts radiation of a first energy to radiation of a second energy, the radiation of the second energy penetrating into the substrate to a depth no deeper than a first penetration depth; a sensing region formed in the substrate and incorporating dopants of a second conductivity type, wherein a sensing junction located at an interface between the sensing region and the substrate, and positioned at a depth below a surface of the substrate that is no deeper than the first penetration depth, collects charge carriers generated in the substrate by the radiation of the second energy; a shielding region formed in the substrate to shield the sensing region from unconverted radiation of the first energy and incorporating dopants of the second conductivity type, wherein a shielding junction located at an interface between the shielding region and the substrate, and positioned at a depth below the surface of the substrate that is deeper than the first penetration depth, collects charge carriers generated in the substrate by unconverted radiation of the first energy.