Rare earth X-ray scintillator compositions
 Decay time in scintillator compositions comprising yttrium or lutetium and gadolinium oxides and europium oxide is decreased by incorporating therein at least one of the oxides of ytterbium, samarium, praseodymium, neodymium, dysprosium, holmium, thulium, cerium and erbium as an acceptor. Other properties including afterglow and radiation damage are maintained at acceptable levels. 
General Electric Company
G C G C C G C
G21K C09K G01T C04B C09K G21K C09K
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Charles David Steven Jude Michael John Alok Mani
Greskovich Duclos Lynch Srivastava