Patent Number: 
Section: claims

1. An X-ray and gamma-ray shielding glass, comprising the following components in weight-%:10-35% SiO2;60-70% PbO;0-8% B2O3;0-10% Al2O3;0-10% Na2O;0-10% K2O;0-0.3% As2O3;0-2% Sb2O3;0-6% BaO; and0.05-2% ZrO2. 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% SiO2;60-67% PbO;1-5% B2O3;0% Al2O3;0.05-2% Na2O;0.1-3% K2O;0-0.3% As2O3;0.1-0.5% Sb2O3;0% BaO; and0.1-2% ZrO2. 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% SiO2;60-65% PbO;1.5-2.5% B2O3;0% Al2O3;0.05-2% Na2O;0.1-3% K2O;0-0.3% As2O3;0.1-0.5% Sb2O3;0% BaO; and0.5-2% ZrO2. 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% SiO2;60-65% PbO;1.5-2.5% B2O3;0% Al2O3;0.05-2% Na2O;0.1-3% K2O;0-0.3% As2O3;0.1-0.5% Sb2O3;0% BaO; and1-2% ZrO2. 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-% B2O3, 0.5-6 weight-% B2O3, and 1-5 weight-% B2O3. 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% SiO2;60-70% PbO;0.5-2% Na2O;0.5-3% K2O;0.5-0.75% Sb2O3;0.05-5% ZrO2; and0-5% BaO;and in that except for contaminants, the composition is free of B2O3, SrO, As2O3. 10. A glass plate, comprising the following components in weight-%:10-35% SiO2;60-70% PbO;0-8% B2O3;0-10% Al2O3;0-10% Na2O;0-10% K2O;0-0.3% As2O3;0-2% Sb2O3;0-6% BaO; and0.05-2% ZrO2, 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% SiO2, 60-70% PbO, 0-8% B2O3, 0-10% Al2O3, 0-10% Na2O, 0-10% K2O, 0-0.3% As2O3, 0-2% Sb2O3, 0-6% BaO, and 0.05-2% ZrO2;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; andcutting 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% SiO2, 60-70% PbO, 0-8% B2O3, 0-10% Al2O3, 0-10% Na2O, 0-10% K2O, 0-0.3% As2O3, 0-2% Sb2O3, 0-6% BaO, and 0.05-2% ZrO2;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; andcutting 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.