Patent ID: 7618491

Claim:
A scintillator single crystal of a cerium-doped silicate compound represented by the following general formula (1) or (2) that contains 0.00005 to 0.1 wt % of Ca based on the total weight of the single crystal: Y 2−(x+y) Ln x Ce y SiO 5 (1) (wherein, Ln represents at least one type of element selected from the group consisting of elements belonging to the rare earth elements, x represents a numerical value of 0 to 2, and y represents a numerical value of greater than 0 but less than or equal to 0.2); Gd 2−(z+w) Ln z Ce w SiO 5 (2) (wherein, Ln represents at least one type of element selected from the group consisting of elements belonging to the rare earth elements, z represents a numerical value of greater than 0 but less than or equal to 2, and w represents a numerical value of greater than 0 but less than or equal to 0.2).