PHOSPHOR FOR RADIATION DETECTOR, PRODUCTION OF CERAMIC COMPRISING SAME, AND ADDITIVE FOR RARE EARTH METAL OXISULFIDE PHOSPHOR CERAMIC

摘要

PROBLEM TO BE SOLVED: To provide a phosphor which is based on a specific rare earth metal oxisulfide, have been doped with a specified amt. of a specific dopant, has a reduced afterglow, retains the luminous intensity, and is useful for an X-ray computer tomograph. ;SOLUTION: This phosphor is based on (A) a rare earth metal oxisulfide of the formula: (M_1-xLn_x)₂O₂S (wherein M is Y, La or Gd; Ln is Eu, Pr, Tb, Yb, Dy, Sm or Ho; and 2×10^-1≥x≥1×10^-6) and has been doped with (B) 10^-1-10^-6 mol.%, pref. 10^-4-10^-6 mol.%, Zr, Hf, Se, Te or Ti.;COPYRIGHT: (C)1996,JPO