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Cadmium tungstate (CdWO4 or CWO) is monoclinic crystal with excellent comprehensive scintillation properties. The emission peak of CdWO4 crystal is around 480nm (with emission range between 380-660 nm), with extremely low afterglow, good radiation resistance.  It shows high density, with a high light output of 13000 photons/MeV. Which has been widely used in the security inspection, medical X-CT, Positron emission tomography (PET) and other industries. The combined application of CdWO4 crystal and B4C can form a compact γ- ray and neutron radiation detector. It can also be applied as a scintillation screens for α and β particles.


Features Applications
  • High light output
  • Good radiation resistance
  • Low afterglow
  • High density
  • High X-ray absorption coefficient
  • Low intrinsic radioactivity level
  • Medical Computed Tomography (CT)
  • Positron emission tomography (PET)
  • The well logging
  • The control and inspection for industrial process
  • Nuclear weapons and waste monitoring

Material Features

Chemical formulaCdWO4
Density (g/cm3)7.9
Melting point (℃)1598
Hardness (Mho)4-4.5
Thermal expansion coeff (C-1)10.2*10-6

Scintillator Properties

Wavelength(Max.emission) (nm)490
Wavelength range (nm)380~800
Decay time (ns)14000
Light output (photons/MeV)13000
Refractive index2.2-2.3
Radiation length (cm)1.06
Afterglow (%)<0.1


CdWO4 X fluorescence spectrumCdWO4 γ multichannel energy spectrum
CdWO4 transmission spectrumCdWO4 decay curve

Related application(s) with CdWO4:

Industrial CT Medical CT

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