Patent ID: 6495845
Filing Date: 2002-12-17
Classification: G01T

Abstract:
A radiation detector comprising:a plurality of semiconductor photo-detector elements and a laminate of a plurality of scintillators, radiation shields interposed between the adjacent scintillators and light reflectors interposed between each of the scintillators and each of the radiation shields, the laminate being mounted on the plurality of the semiconductor photo-detector elements, each of the radiation shields comprising a sintered ceramic having radiation shielding capability, and the sintered ceramic having a composition composed of at least one rare-earth oxide of 0 to 50 mol % in total selected from the group consisting of Gd, La, Ga, Y, Ce, Nd, Pr, Sm, Dy and Yb oxides, at least one alkali-earth oxide of 0 to 33 mol % in total selected from the group consisting of Ca, Ba, Mg and Sr oxides and the balance being at least one oxide selected from the group consisting of V, Ta and Nb oxides.