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RD 50® Radiation Shielding Glass

Monolithic X-ray protection sight glass with increased lead equivalent

Special Properties

  • Increased lead equivalent compared to RD 30®
  • High X-ray absorption
  • Wide range of thicknesses available
  • Large dimensions possible
  • More scratch-resistant than acrylic glass
  • Non-flammable
  • Good transparency

Typical Applications

  • X-ray protection glass for medical applications
  • Protective window for positron emission tomography (PET)
  • Radiation protection in computed tomography (CT)
  • Sight glass for X-ray rooms
  • Radiation protection doors and windows in medical radiology rooms

RD 50® offers increased radiation absorption

RD 50® is a clear transparent dense flint glass which is produced by SCHOTT in Germany. The modified lead-silicate glass is used for shielding X-rays and gamma radiation in medical and industrial applications as well as in research. It has a lead oxide content of > 65% by weight which results in a density of at least 5.05 g/cm2 and thus enables compliance with statutory safety regulations even at comparatively low glass thicknesses. RD 50® has an increased lead equivalent compared to RD 30® and therefore has a higher radiation shielding effect. The X-ray absorption of RD 50® can meet the requirements of the German Institute for Standardization (DIN Germany), European Standardization and the International Electrotechnical Commission. The special composition of RD 50® allows the radiation shielding glass to be used in positron emission tomography (PET) and computer tomography (CT) as well as its combination. The glass is available in a wide range of standard thicknesses. In many cases, it can be polished to custom thicknesses too. If you are looking for a radiation shielding glass that is optimized for mammography applications, please visit our RD 30® website.

To request a quote for sight glass or windows made of original SCHOTT RD 50® high quality radiation shielding glass, please click on the button below:

 

Request for Quotation

 

Please follow the installation, cleaning and care instructions for radiation shielding glass.

 

Specifications

 

Transmission of RD 50® at 5 mm tk.

Show Transmission of RD 50® (5 mm thick)

Transmission of RD 50® at 20 mm tk.

Show Transmission of RD 50® (20 mm thick)

 


Refractive Index

  • nD = 1,79

Mechanical Properties

  • Density: ≥ 5,05 g/cm3
  • Young's modulus E: 56,6 kN/mm2
  • Poisson number µ: 0,245
  • Torsion modulus G: 22,7 kN/mm2
  • Knoop hardness HK 0,1/20: 360
  • Stress optical coefficient C
    in 1,02 x 10-12 m2/N: 0,78

Thermal Properties

  • Mean linear coefficient of thermal expansion:
    7,4 x 10-6/K (20 °C ; 300 °C) (static measurement)
  • Transformation Temperature Tg: 467 °C
  • Viscosities and corresponding temperatures:
    • Strain point (1014,5 dPa): 444 °C
    • Annealing point (1013 dPa): 467 °C
    • Softening point (107,6 dPa): 603 °C
    • Forming temperature (106 dPa): 673 °C
    • Forming temperature (105 dPa): 729 °C
    • Forming temperature (104 dPa): 800 °C
  • Mean specific heat capacity cp:
    0,39 J/(g x K) (20 - 100 °C)
  • Thermal conductivity: 0,62 W/(m x K) (at 50 °C)

Chemical Properties

  • Hydrolytic Resistance according to DIN ISO 719:
    • Hydrolytic Class HGB 1
    • Equivalent of Alkali (Na2O) per g of glass grains: 24 μg/g
  • Acid Resistance according to DIN 12 116:
    • no data available
  • Alkali Resistance according to DIN ISO 695:
    • Alkali Class A3
    • Surface weight loss after 3h:
      510 mg/dm2

Available Glass Thicknesses

Lead equivalent of RD 50® in mm Pb
at minimum thickness
Min. thickness (mm) 5,00 7,00 8,50 10,0 11,5 16,0 20,0
Tube voltage Lead equivalent in mm Pb
76 kV* 1,5 2,1 2,6 3,0 3,4 -- --
80 kV 1,5 2,1 2,6 3,1 3,5 -- --
100 kV 1,5 2,1 2,6 3,1 3,6 5,0 6,3
110 kV 1,5 2,1 2,5 3,0 3,5 4,9 6,1
150 kV 1,5 2,1 2,5 3,0 3,5 4,9 6,1
200 kV 1,4 2,0 2,4 2,9 3,3 4,6 5,8
250 kV 1,4 2,0 2,4 2,8 3,3 4,7 5,9
300 kV 1,4 2,0 2,5 2,9 3,4 4,8 6,1
350 kV* 1,4 2,1 2,5 3,0 3,5 4,9 6,2
400 kV 1,5 2,1 2,6 3,1 3,6 5,0 6,4
450 kV* 1,5 2,1 2,6 3,1 3,6 5,1 6,5
500 kV* 1,5 2,2 2,7 3,2 3,7 5,2 6,6
550 kV* 1,5 2,2 2,7 3,2 3,7 5,3 6,7
600 kV* 1,6 2,2 2,7 3,3 3,8 5,4 6,8
650 kV* 1,6 2,2 2,8 3,3 3,8 5,4 6,9
750 kv* 1,6 2,3 2,8 3,4 3,9 5,5 7,0
1000 kV* 1,6 2,4 2,9 3,5 4,0 5,7 7,3
*no tube voltage according to DIN EN 61331-1

Please make sure to observe the installation, cleaning and maintenance instructions for radiation shielding glass.

 

All given details and specifications are mean reference values and are not guaranteed. In addition, please consider the "Notes on specifications"