Patent ID: 7087905

Claim:
A radiation three-dimensional position detector, comprising: a light receiving element having a light receiving plane, which outputs an electric signal corresponding to the incident position and intensity of light incident on the light receiving plane; and a scintillator unit having scintillator cells each of which produces scintillation light corresponding to the radiation absorbed thereby, wherein K layers of scintillator arrays (K is an integer number of 2 or greater), each having the scintillator cells arrayed in M rows–N columns two-dimensional matrix (each of M and N is an integer number of 2 or greater), are laminated on the light receiving plane of said light receiving element, wherein each of the scintillator cells is separated from the adjacent scintillator cells by partition mediums, and the partition mediums between scintillator cells are made up of either of a reflective material and a translucent material with respect to said scintillation light, and wherein at least one of side faces of a scintillator cell C k1,m,n included in a scintillator array of the k 1 -th layer is faced with the partition medium which has different optical characteristic from that of the partition medium facing the corresponding side face of a scintillator cell C k2,m,n included in a scintillator array of the k 2 -th layer, said corresponding side face being located at the same two-dimensional position as said one of side faces in a plane parallel to the light receiving plane, provided that C k,m,n is defined as a scintillator cell located at m-th row and a n-th column within a scintillator array of the k-th layer (1<k<K, 1<m<M, 1<n<N), and an area enclosed by the partition medium of the reflective material in said k 1 -th layer scintillator array occupies a different region in the plane parallel to the light receiving plane from a region occupied by an area enclosed by the partition medium of the reflective material in said k 2 -th layer scintillator array.