X-ray scintillators and devices incorporating them
 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
C G C G C
C09K G01T C04B G21K C09K
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Alok Mani Michael John Steven Jude Charles David
Srivastava Lynch Duclos Greskovich