Patent ID: 7749323

Claim:
A single crystal for a scintillator that is a single crystal of a cerium-activated orthosilicate compound, represented by general formula (1) or (2) below, that comprises 0.00005 to 0.1 wt. %, based on the entire weight of said single crystal, of at least one element selected from a group consisting of elements belonging to Group 13 of the periodic table: Y 2−(x+y) Ln x Ce y SiO 5 (1) wherein Ln denotes at least one element selected from a group consisting of elements belonging to rare earth elements, x is a numerical value of 0 to 2, and y is a numerical value of more than 0 and equal to or less than 0.2; Gd 2−(z+w) Ln z Ce w SiO 5 (2) wherein Ln denotes at least one element selected from a group consisting of elements belonging to rare earth elements, z is a numerical value of more than 0 and equal to or less than 2, and w is a numerical value of more than 0 and equal to or less than 0.2.