Scintillator single crystal and production method of same
A scintillator single crystal of a specific cerium-doped silicate compound that contains 0.00005 to 0.1 wt % of one or more types of element selected from the group consisting of elements belonging to group 2 of the periodic table based on the total weight of the single crystal.
1. 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).
2. A scintillator single crystal of a cerium-doped silicate compound represented by the following general formula (3) that contains 0.00005 to 0.1 wt % of Ca based on the total weight of the single crystal:
Gd 2−(p+q) Ln p Ce q SiO 5 (3)
(wherein, Ln represents at least one type of element selected from the group consisting of the rare earth elements of Dy, Ho, Er, Tm, Yb, Lu, Y and Sc having a smaller ionic radius than Tb, p represents a numerical value of greater than 0 but less than or equal to 2, and q represents a numerical value of greater than 0 but less than or equal to 0.2).
3. A scintillator single crystal of a cerium-doped silicate compound represented by the following general formula (4) that contains 0.00005 to 0.1 wt % of Ca based on the total weight of the single crystal:
Gd 2−(r+s) Lu r Ce s SiO 5 (4)
(wherein, r represents a numerical value of greater than 0 but less than or equal to 2, and s represents a numerical value of greater than 0 but less than or equal to 0.2).
4. A method for producing the scintillator single crystal according to any of claims 1 to 3 , comprising a step of preparing a raw material that contains Ca as a constituent element.