US5120970A
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X-ray image intensifier tube and x-ray conversion screen containing terbium activated silicate luminescent glasses
Assignee: COLLIMATED HOLES Inc
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Filing: 1991-06-24
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Granted: 1992-06-09
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Expires: 2011-06-24
Abstract
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.
Inventors
- 👤 Robert A. Buchanan
- 👤 Clifford Bueno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:14
CPC Classifications
G; G21; G21K; G21K4/00; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/076; C03C3/095; C03C4/00; C03C4/12; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7743; C09K11/77494; C09K11/7766; C09K11/77744; C09K11/7783; C09K11/77924; G21K2004/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
154 words
An x ray image intensifier comprising an input screen consisting essentially of a fiber optic scintillating plate of a luminescent terbium-activated silicate glass exhibiting reduced phosphorescence and background buildup and enhanced luminescent responsivity under x-ray illumination energy between about 5 keV to 16 MeV and consisting essentially, by weight on the oxide basis, of about 3-25% R 2 O, wherein R 2 O consists of 0-5% Li 2 O, 0-25% Na 2 O, 0-25% K 2 O, 0-25% Rb 2 O and 0-25% Cs 2 O; 5-55% RO wherein RO consists of 0-20% MgO, 0-30% CaO, 0-45% SrO and 0-55% BaO; 35-70% SiO 2 ; 0-20% R 2 O 3 wherein R 2 O 3 consists of 0-20% La 2 O 3 and 0-15% Y 2 O 3 ; oxide selected from the group consisting of cerium oxide and europium oxide; 5-20% Tb.sub. 2 O 3 ; and 1-15% Gd 2 O 3 .
Claim 2
Dependent Claim
154 words
An x ray image intensifier comprising an input screen consisting essentially of a fiber optic scintillating plate of a luminescent terbium-activated silicate glass exhibiting reduced phosphorescence and background buildup and enhanced luminescent responsivity under x-ray illumination energy between about 5 keV to 16 MeV and consisting essentially, by weight on the oxide basis, of about 3-25% R 2 O, wherein R 2 O consists of 0-5% Li 2 O, 0-25% Na 2 O, 0-25% K 2 O, 0-25% Rb 2 O and 0-25% Cs 2 O; 5-55% RO wherein RO consists of 0-20% MgO, 0-30% CaO, 0-45% SrO and 0-55% BaO; 35-70% SiO 2 ; 0-20% R 2 O 3 wherein R 2 O 3 consists of 0-20% La 2 O 3 and 0-15% Y 2 O 3 ; oxide selected from the group consisting of cerium oxide and europium oxide; 5-20% Tb.sub. 2 O 3 ; and 1-15% Gd 2 O 3 .
Claim 3
Dependent Claim
25 words
An x-ray image intensifier tube in accordance with claim 1 wherein said terbium oxide is present in an amount of about 6 to 12 percent.
Claim 4
Dependent Claim
31 words
An x-ray image intensifier tube in accordance with claim 1 wherein said at least one oxide of cerium and europium is present in an amount of about 0.1 to 1.0 percent.
Claim 5
Dependent Claim
25 words
An x-ray image intensifier tube in accordance with claim 1 wherein said gadolinium oxide is present in an amount of about 1 to 10 percent.
Claim 6
Dependent Claim
149 words
A glass x-ray conversion screen consisting essentially of a luminescent, terbium-activated silicate glass exhibiting reduced phosphorescence and background buildup and enhanced luminescent responsivity under x-ray illumination energy between about 5 keV to 16 Mev and consisting essentially, by weight on the oxide basis, of about 3-25% R 2 O wherein R 2 O consists of 0-5% Li 2 O, 0-25% Na 2 O, 0-25% K 2 O, 0-25% Rb 2 O and 0-25% Cs 2 O; 5-55% RO wherein RO consists of 0-20% MgO, 0-30% CaO, 0-45% SrO and 0-55% BaO; 35-70% SiO 2 ; 0-20% R 2 O 3 wherein R 2 O 3 consists of 0-20% La 2 O 3 and 0-15% Y 2 O 3 ; 0.1-2% of at least one oxide selected from the group consisting of cerium oxide and europium oxide; 5-20% Tb 2 O 3 ; and 1-15% Gd 2 O 3 .
Claim 7
Dependent Claim
149 words
A glass x-ray conversion screen consisting essentially of a luminescent, terbium-activated silicate glass exhibiting reduced phosphorescence and background buildup and enhanced luminescent responsivity under x-ray illumination energy between about 5 keV to 16 Mev and consisting essentially, by weight on the oxide basis, of about 3-25% R 2 O wherein R 2 O consists of 0-5% Li 2 O, 0-25% Na 2 O, 0-25% K 2 O, 0-25% Rb 2 O and 0-25% Cs 2 O; 5-55% RO wherein RO consists of 0-20% MgO, 0-30% CaO, 0-45% SrO and 0-55% BaO; 35-70% SiO 2 ; 0-20% R 2 O 3 wherein R 2 O 3 consists of 0-20% La 2 O 3 and 0-15% Y 2 O 3 ; 0.1-2% of at least one oxide selected from the group consisting of cerium oxide and europium oxide; 5-20% Tb 2 O 3 ; and 1-15% Gd 2 O 3 .
Claim 8
Dependent Claim
25 words
A glass x-ray conversion screen in accordance with claim 5 wherein said terbium oxide is present in an amount of about 6 to 12 percent.
Claim 9
Dependent Claim
31 words
A glass x-ray conversion screen in accordance with claim 5 wherein said at least one oxide of cerium and europium is present in an amount of about 0.1 to 1.0 percent.
Claim 10
Dependent Claim
25 words
A glass x-ray conversion screen in accordance with claim 5 wherein said gadolinium oxide is present in an amount of about 1 to 10 percent.
Claim 11
Dependent Claim
156 words
An x-ray conversion screen consisting essentially of a fiber optic scintillating plate of a luminescent terbium-activated silicate glass exhibiting reduced phosphorescence and background buildup and enhanced luminescent responsivity under x-ray illumination energy between about 5 keV to 16 MeV and consisting essentially, by weight on the oxide basis, of about 3-25% R 2 O wherein R 2 O consists of 0-5% Li 2 O, 0-25% Na 2 O, 0-25% K 2 O, 0-25% Rb 2 O and 0-25% Cs 2 O; 5-55% RO wherein RO consists of 0-20% M g O, 0-30% CaO, 0-45% SrO and 0-55% BaO; 35-70% SiO 2 ; 0-20% R 2 O 3 wherein R 2 O 3 consists of 0-20% La 2 O 3 and 0-15% Y 2 O 3 ; 0.1-2% of at least one oxide selected from the group consisting of cerium oxide and europium oxide; 5-20% Tb 2 O 3 , and 1-15% Gd 2 O 3 .
Claim 12
Dependent Claim
156 words
An x-ray conversion screen consisting essentially of a fiber optic scintillating plate of a luminescent terbium-activated silicate glass exhibiting reduced phosphorescence and background buildup and enhanced luminescent responsivity under x-ray illumination energy between about 5 keV to 16 MeV and consisting essentially, by weight on the oxide basis, of about 3-25% R 2 O wherein R 2 O consists of 0-5% Li 2 O, 0-25% Na 2 O, 0-25% K 2 O, 0-25% Rb 2 O and 0-25% Cs 2 O; 5-55% RO wherein RO consists of 0-20% M g O, 0-30% CaO, 0-45% SrO and 0-55% BaO; 35-70% SiO 2 ; 0-20% R 2 O 3 wherein R 2 O 3 consists of 0-20% La 2 O 3 and 0-15% Y 2 O 3 ; 0.1-2% of at least one oxide selected from the group consisting of cerium oxide and europium oxide; 5-20% Tb 2 O 3 , and 1-15% Gd 2 O 3 .
Claim 13
Dependent Claim
24 words
An x-ray conversion screen in accordance with claim 9 wherein said terbium oxide is present in an amount of about 6 to 12 percent.
Claim 14
Dependent Claim
30 words
An x-ray conversion screen in accordance with claim 9 wherein said at least one oxide of cerium and europium is present in an amount of about 0.1 to 1.0 percent.
Claim 15
Dependent Claim
24 words
An x-ray conversion screen in accordance with claim 9 wherein said gadolinium oxide is present in an amount of about 1 to 10 percent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-09 | 1995-12-09 | 1996-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-09 | 1999-12-09 | 2000-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-09 | 2003-12-09 | 2004-06-09 | $7700.00 | Window Closed / Lapsed |