Gamma Ray Shielding Glass



Gamma Ray Shielding Glass

Pro-GR lead shielding glass was developed to protect against high radiation gamma rays used in PET scan facilities. Pro-GR is made of glass materials having a lead oxide content rate of roughly 70% that is equivalent to ultra-high lead content block glass for nuclear power facilities. Pro-GR has a radiation shielding capability higher than that of conventional LX-57B.

"Architecture is inhabited sculpture."

-Constantin Brancusi


  • Comprised of glass materials having a lead oxide content rate of roughly 70%
  • Equivalent to ultra-high lead content block glass for nuclear power facilities
  • Available in two thicknesses, LX 14.7 (14.7 mm) and LX 21.8 (21.8 mm)
  • Pro-GR has a radiation shielding capability higher than LX-57B X-Ray shielding lead glass


Ideal for use in PET Scan facilities.


Shielding Performance Against Gamma Rays

In calculating the shielding performance of Pro-GR against 0.511 MeV gamma rays, the Monte Carlo simulation is used to calculate the build-up factor of Pro-GR glass, and calculates the effective dose transmission factor in accordance with the Manual for Shielding Calculation of Radiation Facilities, 2000 (issued by the Nuclear Safety Technology Center). In calculating the lead equivalent of Pro-GR, the thickness of Pro-GR was designed so that the effective dose transmission factor is equivalent to the effective dose transmission factor of lead calculated by taking the build-up factor into account as shown in the following table.

Effective Dose Transmission Factor Of Lead For 0.511 Mev Gamma Rays And Thickness Of Pro-GR Corresponding To Each Thickness Of Lead

Thickness Effective Dose Transmission Factor Pro-GR Thickness Recommended
(Corresponds to Lead Effective Dose Transmission)
Recommended Product
5.0 mm
52.6 14.2 mm
14.7 mm
7.5 mm
36.0 21.3 mm
21.8 mm
Note: Numbers in brackets [ ] are reference values and are the build-up factors of Lead and Pro-GR.
In the case of 0.2 MeV X-Rays, the effective dose transmission factor of lead at 5mm thickness is 0.48% and 7.5mm is .0.033%


  PRO-GR 14.7 PRO-GR 21.8
Thickness (mm) 14.7 21.8
Effective Dose Transmission Factor* (%) 52.6 36.0
Lead Equivalent (mmPb) 5.0 7.5
Minimum Size 42” x 60” (1000 mm x 1500mm) 42” x 60” (1000 mm x 1500mm)
Specific Gravity Min. 5.20 Min. 5.20
Knoop Hardness 320 320
Visible Light Transmission 83% 83%
*Values for effective dose transmission factor and lead equivalent are for gamma rays (0.511 MeV)
Note: "Seeds" or minute air bubbles exist inside Pro-GR as it is made of special glass materials. This, however, does not adversely affect its radiation shielding performance.


Product Fact Sheet

The time, in minutes or hours, that materials or assemblies can be expected to prevent flames and smoke from spreading.

As heat develops within the source area, pressure within the enclosed room begins to build relative to the pressure outside. Once the fire reaches equilibrium in the positive pressure zone, smoke, hot gases and flames are forced through any openings in the door or window assembly. Testing to the UL 10C standard more closely simulates real fire conditions.

Blocks radiant and conductive heat transfer from one side of the glass to the other. A required characteristic of glass used as a wall.

Classified and labeled by Underwriters Laboratories, Inc.® (UL), an independent product safety certification organization.

Immediately following a furnace test, heated glass is subjected to water from a fire hose. The cooling, impact and erosion created by the hose stream tests the integrity of the glass. In the U.S., the hose stream test is required for all fire ratings over 45 minutes (all fire ratings require it in Canada).

Available as a temperature rise door with Pilkington Pyrostop® fire-resistive-rated glass for 60-90 minute applications

Temperature rise doors provide a barrier to radiant and conductive heat transfer.

Available in stainless steel frame finish options for increased design flexibility.

Building codes clearly define hazardous locations where impact safety glass is required. Glass with this designation has been tested to meet impact safety requirements required for areas such as doors, sidelights, and areas close to the floor.

FireLite IGU is a fire-rated insulated glass ceramic unit that also complies with energy codes. It is designed for use in exterior applications where energy codes require an insulated product, or for interior applications with special needs such as sound reduction.

Withstands continuous temperatures to 1292° F for use in high efficiency heating appliances.

The ability of glass ceramic to withstand sudden heating, cooling, or both without cracking, shattering or exploding out of the frame.

The ability of the glass to stop various types of ammunition. Ratings are assigned in levels from 1 to 8, with a Level 8 rating being the highest (able to stop a 7.62mm rifle lead core full metal copper jacket, military ball).

The capacity of an element in a building structure to support a weight in addition to its own.

Listed and labeled by Intertek, an independent assurance, testing, inspection and certification organization.

Glazing designed to increase the amount of time required to gain entry. This additional time is intended to allow for the enactment of lock-down protocols and to allow for the arrival of emergency response teams. May be used in areas with high risk of prolonged attack or in critical areas such as vestibules. Forced entry resistant glazing should also resist penetration from hand-held or hand-thrown objects such as hammers, crowbars, bats, knives, bricks and rocks. (Source: NGA Glass Technical Paper FB71-21)

This product is both fire- and security-rated and is appropriate for educational facilities.

This product is smoke-rated and tested to UL 1784.

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