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CdWO4 Arrays

  • Low after-glow
  • High density, high Z scintillator
  • Relatively high light yield
  • Withstands high energy radiation damage
  • Suitable for low activity counting application

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Basic Properties:

Melting Point (℃) 1598 Density (g/cm3) 7.9
Hygroscopic None Hardness(ns) 4-4.5
Wavelength of Emission Max.(nm) 475 Refractive Index of Emission Max 2.2-2.3
Decay Time(ns) 14000 Photoelectron Yield (% of NaI(Tl)) (for γ-rays) 30-50
Afterglow(%@3ms) <0.1 Radiation Length(cm) 1.06


Modules or Types:
Single Element Size: customized
Linear Array: 8, 16, 32, 64…elements
2-Dimensional Array: 6×10, 12×18, 24×36…elements
Light Output: 12,000-15,000 Photons/MeV
Afterglow: 0.1%(max) after 3ms
Reflector: polymer with TiO2(excellent reflection to ensure minimized cross talk)

Cadmium tungstate (CdWO4) is a high density, high atomic number scintillator with relatively high light yield, and extreme low after glow. The after glow at 3ms is less than 0.1%. 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. 

CdWO4 arrays are widely used in X-CT equipment, it has extremely low afterglow property, which is of great importance of fast inspection, especially in the cargo container of customs, while in the X-CT equipment due to its relatively high light output, high density and strong prevention of X ray property, also in the high energy physics because of its strong anti-radiation.

Application Notes:

  • Security inspection
  • X-ray CT
  • High energy physics
  • Nuclear medicine