PROCEDURE TO OBTAIN GD2O2S: PR FOR CT WITH A VERY SHORT AFTERGLOW

摘要

The present invention is directed to a Gd2O2S:M fluorescent ceramic material with a very short afterglow, wherein M represents at least one element selected from the group Pr, Th, Yb, Dy, Sm and/or Ho and the Gd2O2S:M fluorescent ceramic material comprises further: europium of≰1 wt. ppm based on Gd2O2S, and cerium of≧0.1 wt. ppm to≰100 wt. ppm based on Gd2O2S, wherein the content of cerium is in excess of the content of europium with a ratio of europium to cerium of 1:10 to 1:150.