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US 5,391,320 AGranted
Terbium activated silicate luminescent glasses
AssigneeLockheed Missiles & Space Company, Inc.
InventorsRobert A. Buchanan, Clifford Bueno
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Abstract
This invention relates to terbium activated silicate luminescent glasses exhibiting reduced afterglow and enhanced luminescence due to incorporation therein of selected rare earth oxides of cerium, europium and gadolinium.
Claims7
A luminescent terbium-activated silicate glass exhibiting luminescence responsivity under x-ray radiation in the range of from about 5 keV to about 16 MeV and consisting essentially by weight on the oxide basis, of about 3-25% R.sub.2 O wherein R.sub.2 O consists of 0-5% Li.sub.2 O, 0-25% Na.sub.2 O, 0-25% K.sub.2 O, 0-25% Rb.sub.2 O and 0-25% Cs.sub.2 O;
- 5-55% RO wherein RO consists of 0-20% MgO, 0-30% CaO, 0-45% SrO and 0-55% BaO;
- 35-56.1% SiO.sub.2 ;
- 0-20% R.sub.2 O.sub.3 wherein R.sub.2 O.sub.3 consists of 0-20% La.sub.2 O.sub.3 and 0-15% Y.sub.2 O.sub.3 ;
- 0.1-2% of at least one oxide selected from the group consisting of cerium oxide and europium oxide;
- 0.75-20% Tb.sub.2 O.sub.3 and 1-15% Gd.sub.2 O.sub.3.
2 more elements
Dependencies are inferred from the claim text.