LX-57B Lead Glass Radiation Shielding

for Gamma and X-Ray

Radiation Shielding Lead GlassLX-57B Radiation Shielding Lead Glass and Saf-T-Lite Radiation Protector™ Glass can be used in any facility which requires protection from x-ray radiation.  The following industries have common aplications for x-ray radiation shields:

 Medical use of Lead Glass:  Lead glass can be used for X-ray observation equipment, electron beam/plasma generators and X-ray TV detectors. Lead glass protects doctors and staff from X-ray irradiation with no glass discoloration or deterioration in viewing quality. Use of the larger size LX windows facilitates remote control of X-ray equipment.

Industrial use of Lead Glass: Used to protect people from airport luggage inspection equipment in airports, and from radiation testing equipment or radioactive industrial products at industrial sites.Nuclear use of Lead Glass:
Leaded glass can be used for observation windows at radioactive storage stations, nuclear fuel development and reprocessing plants, and for applications near nuclear reactors.

LX-57B glass can be manufactured curved or flat.  Thicknesses:  8 mm, 11 mm, and 14 mm.

Custom Sizes:  Any size up to and including 48" x 96" is available. Stock Sizes:  For cost effectiveness, the following stock sizes are offered: (size in inches)

Sizes

LX-57B Lead Glass

Standard Thickness values

Lead equivalence (mm) 1.8 - 2.0 2.5-2.7 3.0-3.2
Lead equivalence (in) (1/16) (3/32) (1/8)
Thickness (mm) 7.0 10.5-11.5 13.5-14.5

X-ray peak voltage (Kv)

150

150

200

LX-57B Lead Glass
Standard Sizes (inches)
8 x 10 24 x 36
10 x 10 24 x 48
10 x 12 30 x 30
12 x 12 30 x 36
12 x 16 32 x 40
12 x 18 36 x 36
12 x 20 36 x 48
12 x 24 36 x 60
14 x 18 36 x 72
16 x 20 36 x 84
16 x 24 36 x 96
18 x 24 48 x 48
18 x 26 48 x 60
20 x 24 48 x 72
24 x 24 48 x 84
24 x 30 48 x 96

Lead Glass VS Acrylic / Plastic

Relative Thickness

For the same lead equivalent, acrylic/plastic has to be approximately five times thicker than LX lead glass - significantly reducing observation capabilities. For example, at 1.8 mm - 2.0 mm Pb, lead glass would be 5/16" thick. Acrylic/plastic would be approximately 1-1/2" thick for the same protection.

The extra thickness of acrylic/plastic may require special framing. LX fits standard sized frames.
 

 

 

Resistance to Discoloration

Acrylic/plastic discolors when exposed to ultraviolet rays. Acrylic/ plastic is also susceptible to discoloration from chemicals in everyday use, such as cleaning materials... or even smoke. LX-57B glass suffers no discoloration due to radiation and has a high chemical resistance as well.

The durable LX glass retains its appealing visual clarity.

 

 

Weight Factor

For the same size requirement and lead equivalent, acrylic/plastic has nearly twice the weight of glass (1.8 times).

 

 

Light Transmittance

For the same lead equivalent, glass transmits more light than acrylic/ plastic
 

 

 

Combustibility

LX-57B is an incombustible material because it's glass. Acrylic/plastic is combustible. When acrylic/plastic burns, it emits toxic fumes. When acrylic/plastic is cut, it may emit toxic fumes. This does not happen with LX lead glass.
 

 

 

Surface Hardness

Both surfaces of LX-57B glass are mirror polished. Using Mohs' hardness scale, LX-57B tests at Level 6 (compatible to feldspar, a constituent of granite). Acrylic/plastic test at Level 3 (equivalent to calcite, a constituent of limestone and chalk).
 

 

 

Abrasion Resistance

LX-57B has greater resistance to scratches because of its hard surface. Unlike glass, acrylic/plastic can easily be scratched in cleaning because of its softer surface, reducing its light transmittance and clarity.
 


Materials

Glass:  Lead barium type, of high quality optical grade with over 60 percent heavy metal oxide, including at least 55 percent PbO.

Properties 

Sample 8 mm thick LX-57B lead glass:  
Minimum density:  4.36
Refractive index (Nd):  1.71
Thermal expansion coefficient: 80 X 107/0C (30~380 deg C)
Mohs' hardness  6

Lead equivalence chart:

Thickness and Lead Equivalents
Thickness (mm) 7 mm 11 mm 14 mm
Lead Equivalent (mm Pb) 1.8-2.0 2.5-2.7 3.0-3.2
X-Ray Tube Peak Voltage (kV) 150 150 200
Lead Equivalent (lb/sq.ft.) 4.2-4.6 5.8-6.2 6.9-7.4
Minimum Desity (g/cm3) 4.36 4.36 4.36
Weight (lb/sq.ft.) 7.1 9.8 12.5
To calculate the values of the range of "Lead Equivalent (lb.sq.ft.)', we converted from the values of the range of 'Lead Equivalent (mm Pb)' using the mentioned figures and rounded off the fractions to one decimal place. 1 foot = 30.48 cm / 1 pound = 453.59 g / Density of lead =11.3 (g/cm3)

Performance Comparison:  Lead Glass vs. Acrylic/Plastic Sheet

Property LX-57B Lead Glass Lead Acrylic/Plastic Sheet Best Product
Combustible No Yes LX-57B Lead Glass
Effect of Water Absorption None Effect Length and Thickness LX-57B Lead Glass
Installation Standard Requires Special Care LX-57B Lead Glass
Light Transmission
(1.8 mm Lead Equiv., at 150kV)
87.3% 59.5% LX-57B Lead Glass
Weight 7 lbs per sq. ft. 14 lbs per sq. ft. LX-57B Lead Glass
Effects of Sun None Causes Cracking LX-57B Lead Glass
Chemical Resistance      
     a) Acid Greater Less LX-57B Lead Glass
     b) Alkali Greater Less LX-57B Lead Glass
Radiation Shielding Lead Glass

Lead-glass utilizes lead in the form of lead oxide into the glass during the manufacturing process. The lead-glass effectiveness for x-ray shielding increases the attenuation of ionizing photons emitted by x-ray equipment, because this property increases dramatically as the atomic number of the attenuating material increases. The attenuation of x-ray photons increases as the mass density of the attenuating material (lead glass) increases. Furthermore, the lead glass attenuation of such photons also increases dramatically as the energies of the ionizing photons decrease. Lead has a high atomic number, and its atomic mass that further increases the density of lead glass. X-rays used in medicine, specifically diagnostic x rays, often have lower energies on the ionizing radiation spectrum, which are easily shielded by leaded glass. The lead glass used in windows often contains lead that creates an attenuation to 1.8 to 3.2 mm of pure lead.


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