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      CdWO4 Cadmium Tungstate

      CdWO4 Cadmium Tungstate

      Emission Spectra

      Cadmium tungstate (CdWO4) is a high density, high atomic number scintillator with relatively high light yield. The emission maximum is at 475nm and the total light output is 12 to 15 photons/keV. The light yield relative to NaI(Tl) on a bialkali PMT is 30 to 50%. The high density and stopping power of CdWO4 make it an efficient absorber, particularly for high energy X-ray. It takes only 3mm to stop up to 150keV photons.

       

       

      Uses/Applications

      • Medical - Computed Tomography (CT)
      • Security - Luggage, container and cargo scanning
       

      Features/Benefits

      • Low afterglow
      • Withstands high energy radiation damage
      • High density, high Z scintillator
      • Suitable for low activity counting applications
      • Relatively high light yield

       

      Packaging Options

      CdWO4 is non-hygroscopic and does not require a hermetic package.  Crystals are typically provided in block or arrray form and is a good match to photodiodes.

      Typical Sizes

      Arrays with pixels as small as 0.3mm x 1mm have been provided. In other forms, round crystals range from 50mm diameter x .5mm minimum; for rectangular sizes, (depending on geometry), crystals can typically range in cross-sections as large as 130mm x 50mm or as thin as 10 microns (size dependant). Contact Saint-Gobain for specific applications and alternate sizes.

      Properties

      Properties Value
      Density [g/cm3] 7.9
      Melting point [K] 1598
      Thermal expansion coefficient [C-1] 10.2 x 10-6
      Cleavage plane <010>
      Hardness (Mho) 4-4.5
      Hygroscopic No
      Wavelength of emission max. [nm]  475
      Lower wavelength cutoff [nm] 330
      Refractive index @ emission max 2.2-2.3
      Primary decay time [ns]  14000
      Light yield [photons/keVγ]  12-15
      Photoelectron yield [% of NaI(Tl)] (for γ-rays) 30-50

      Related Resources

       Cadmium Tungstate Material Data Sheet
       Efficiency Calculations Brochure

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