X-ray and gamma-ray shielding glass

Patent metadata

Field	Value
Publication number	US-10035725-B2
Application number	US-201715423052-A
Country	US
Kind code	B2
Filing date	Feb 2, 2017
Priority date	Feb 2, 2016
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

An X-ray and gamma-ray shielding glass, including the following components in weight-%:
10-35% SiO 2 ; 60-70% PbO; 0-8% B 2 O 3 ; 0-10% Al 2 O 3 ; 0-10% Na 2 O; 0-10% K 2 O; 0-0.3% As 2 O 3 ; 0-2% Sb 2 O 3 ; 0-6% BaO; and 0.05-2% ZrO 2 .

First claim

What is claimed is:

1. An X-ray and gamma-ray shielding glass, comprising the following components in weight-%:
10-35% SiO 2 ;
60-70% PbO;
0-8% B 2 O 3 ;
0-10% Al 2 O 3 ;
0-10% Na 2 O;
0-10% K 2 O;
0-0.3% As 2 O 3 ;
0-2% Sb 2 O 3 ;
0-6% BaO; and
0.05-2% ZrO 2 .

2. The X-ray and gamma-ray shielding glass composition according to claim 1 , wherein said glass includes the following composition in weight-%:
20-30% SiO 2 ;
60-67% PbO;
1-5% B 2 O 3 ;
0% Al 2 O 3 ;
0.05-2% Na 2 O;
0.1-3% K 2 O;
0-0.3% As 2 O 3 ;
0.1-0.5% Sb 2 O 3 ;
0% BaO; and
0.1-2% ZrO 2 .

3. The X-ray and gamma-ray shielding glass composition according to claim 1 , wherein said glass includes the following composition in weight-%:
20-30% SiO 2 ;
60-65% PbO;
1.5-2.5% B 2 O 3 ;
0% Al 2 O 3 ;
0.05-2% Na 2 O;
0.1-3% K 2 O;
0-0.3% As 2 O 3 ;
0.1-0.5% Sb 2 O 3 ;
0% BaO; and
0.5-2% ZrO 2 .

4. The X-ray and gamma-ray shielding glass composition according to claim 1 , wherein said glass includes the following composition in weight-%:
20-30% SiO 2 ;
60-65% PbO;
1.5-2.5% B 2 O 3 ;
0% Al 2 O 3 ;
0.05-2% Na 2 O;
0.1-3% K 2 O;
0-0.3% As 2 O 3 ;
0.1-0.5% Sb 2 O 3 ;
0% BaO; and
1-2% ZrO 2 .

5. The X-ray and gamma-ray shielding glass composition according to claim 1 , wherein said glass is BaO-free, except for contaminants.

6. The X-ray and gamma-ray shielding glass composition according to claim 1 , wherein said glass also includes at least one of 1-8 weight-% B 2 O 3 , 0.5-6 weight-% B 2 O 3 , and 1-5 weight-% B 2 O 3 .

7. The X-ray and gamma-ray shielding glass composition according to claim 1 , wherein the composition is selected so that a kinetic of crystallization dØ/dt is at least one of less than 0.2 μm/min., less than 0.1 μm/min., less than 0.05 μm/min., and less than 0.02 μm/min.

8. The X-ray and gamma-ray shielding glass composition according to claim 1 , wherein except for contaminants, the glass does not contain at least one of SrO and MgO.

9. The X-ray and gamma-ray shielding glass composition according to claim 1 , wherein said glass includes the following composition in weight-%:
25-35% SiO 2 ;
60-70% PbO;
0.5-2% Na 2 O;
0.5-3% K 2 O;
0.5-0.75% Sb 2 O 3 ;
0.05-5% ZrO 2 ; and
0-5% BaO;
and in that except for contaminants, the composition is free of B 2 O 3 , SrO, As 2 O 3 .

10. A glass plate, comprising the following components in weight-%:
10-35% SiO 2 ;
60-70% PbO;
0-8% B 2 O 3 ;
0-10% Al 2 O 3 ;
0-10% Na 2 O;
0-10% K 2 O;
0-0.3% As 2 O 3 ;
0-2% Sb 2 O 3 ;
0-6% BaO; and
0.05-2% ZrO 2 , wherein the glass plate has a thickness in the rage of 5 μm to 50 mm.

11. The glass plate according to claim 10 , wherein said thickness is in the range of 25 μm to 20 mm.

12. The glass plate according to claim 10 , wherein said thickness is in the range of 0.8 mm to 10 mm.

13. The glass plate according to claim 10 , wherein at a thickness of 10 mm and a wavelength of 400 nm, the glass plate has a transmission which is at least one of >50%, >70%, >75%, and >80%.

14. The glass plate according to claim 13 , wherein at a thickness of 10 mm and a wavelength of 400 nm, the glass plate has a transmission in the range of 75% to 90%.

15. A method to produce gamma-ray shielding glass plates, wherein the method comprises the following steps:
providing a glass composition including the following components in weight-%: 10-35% SiO 2 , 60-70% PbO, 0-8% B 2 O 3 , 0-10% Al 2 O 3 , 0-10% Na 2 O, 0-10% K 2 O, 0-0.3% As 2 O 3 , 0-2% Sb 2 O 3 , 0-6% BaO, and 0.05-2% ZrO 2 ;
drawing a glass ribbon with a thickness in the range of 0.8 mm to 20 mm upwards from a melt against gravitational force,
guiding the glass ribbon by a plurality of rolls;
running the glass ribbon through a cooling section; and
cutting the glass ribbon into glass plates.

16. The method according to claim 15 , wherein said thickness of the glass ribbon is in the range of 0.8 mm to 10 mm.

17. A method to produce gamma-ray shielding glass plates, wherein the method comprises the following steps:
providing a glass composition including the following components in weight-%: 10-35% SiO 2 , 60-70% PbO, 0-8% B 2 O 3 , 0-10% Al 2 O 3 , 0-10% Na 2 O, 0-10% K 2 O, 0-0.3% As 2 O 3 , 0-2% Sb 2 O 3 , 0-6% BaO, and 0.05-2% ZrO 2 ;
drawing a glass ribbon with a thickness in the range of 25 μm-1.1 mm downwards from a melt with the gravitational force,
guiding the glass ribbon by a plurality of rolls;
running the glass ribbon through a cooling section; and
cutting the glass ribbon into glass plates.

18. The method according to claim 15 , wherein the method is performed so that a kinetic of crystallization of the glass composition dØ/dt is at least one of less than 0.3 μm/min., less than 0.2 μm/min., less than 0.1 μm/min., less than 0.05 μm/min., and less than 0.02 μm/min.

19. The method according to claim 17 , wherein the method is performed so that a kinetic of crystallization of the glass composition dØ/dt is at least one of less than 0.3 μm/min., less than 0.2 μm/min., less than 0.1 μm/min., less than 0.05 μm/min., and less than 0.02 μm/min.

Assignees

• Schott Ag

Inventors

• Krzyzak Marta
• Carré Antoine
• Niessner Lothar
• Hegemann Andreas

Classifications

• C03B33/02

  Cutting or splitting sheet glass {or ribbons}; Apparatus or machines therefor (C03B33/09 takes precedence; glass-cutting tools C03B33/10) · CPC title

• C03C4/08

  for glass selectively absorbing radiation of specified wave lengths · CPC title

• C03B15/02

  Drawing glass sheets · CPC title

• C03C4/087

  for X-rays absorbing glass · CPC title

• C03C2204/00

  Glasses, glazes or enamels with special properties · CPC title