Protective glass
Used to protect against harmful radiation. Set in special frames it can be used as part of a wall for instance as the window in the operators room, in permanent windows and screens as well as mobile screens used to protect the operator during procedures with use of x-rays.
 X-ray shielding glass, equivalencies in mm Pb
Radiation protection lead glass expressed in the increase in glass thickness based on the required lead equivalency:
| Glass thickness [mm] |
Lead equivalency [mm] |
Comment |
| 6,0 |
1,1 |
Lead equivalency guarantied within 60-150kV, density 4,5 |
| 7,0 |
1,5 |
| 8,0 |
1,8 |
| 9,0 |
2,0 |
| 10,0 |
2,2 |
| 11,0 |
2,5 |
| 14,0 |
3,0 |
Lead equivalence guarantied within 60-200kV |
| 14,7 |
5,0 |
Pro GR glass, at gamma ray 511keV |
| 21,8 |
7,5 |
| |
Specific gravity |
Min. 4.36 |
| Thermal properties |
Thermal expansion coefficient (/°C) |
80 x 10-7 (30-380°C) |
| Deformation temperature (/°C) |
400 |
| Flammability |
Nonflammable |
| Mechanical properties |
Bending strength (kgf/cm2) |
262 |
| Young`s modulus (kgf/cm2) |
6.4 x 105 |
| Poisson ratio |
0.24 |
| Surface hardness [Knoop hardness] (kgf/cm2) |
370 |
| Optical properties |
Refractive index (Na-D rays) |
1.71 |
| Average transmittance in visible ray range |
6 mm thickness (1.1 mm Pb) |
86.4 |
| 7 mm thickness (1.5 mm Pb) |
86.4 |
| 9 mm thickness (2.0 mm Pb) |
86.4 |
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Marcin Chytła
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