Advatech CdWO4 Scintillation Crystals
CdWO4 scintillator crystals are highly effective gamma-ray absorbers due to their high density and high Z characteristics.

CdWO4 scintillator crystals are:
  • Mechanically robust characteristics and are non-hygroscopic
  • Stable scintillating characteristics up to c.100 rad
  • Virtually no afterglow emissions
  • No cleavage planes, so can me easily machined into various shapes and geometries

CdWO4 scintillator crystals have the following issues which should be noted. They:
  • Have a light emission with a good part above 500nm, a region where photomultipliers are less sensitive
  • Are intrinsically radioactive making it unacceptable for some applications
  • Are susceptible to radiation damage, starting with doses between 1 and 10 Gray (10² - 10³ rad). Reversible with time or annealing.

CdWO4 scintillator crystals are useful in diverse applications such as:
  • Positron Emission Tomography (PET)
  • Compton suppression spectrometers
  • Geological logging
  • Specialist applications in high energy, nuclear, space and medical physics
CdWO4 Scintillation Crystals
- Properties -
CdWO4 Scintillator Emission Spectrum
CdWO4 Scintillator Emission Spectrum
CdWO4 Mass Attenuation Coefficients
CdWO4 Mass Attenuation Coefficients
CdWO4 Scintillation Crystals
- Optical Properties -
Property Units Value
Wavelength (Max. Emission) nm 490
Wavelength Range nm 380 - 800
Decay Times ns 5000
Light Yield photons/keV 28
Photoelectron Yield % of NaI(Tl) 35 - 40
Radiation Length cm 1.06
Optical Transmission µm TBA
Transmittance % TBA
Refractive Index TBA
Reflection Loss/Surface % TBA
Neutron Capture Cross-section barns TBA
CdWO4 Scintillation Crystals
- Mechanical Properties -
Property Units Value
Chemical Formula CdWO4
Density g/cm³ 7.9
Atomic Number (Effective) 74
Melting Point ºK 1325
Thermal Expansion Coeff. C⁻¹ 10.2 x 10‾⁶
Melting Point ºC 1386
Thermal Expansion Coeff. C⁻¹ 10.2 x 10‾⁶
Cleavage Plane Mono
Hardness Mho 4 to 4.5
Hygroscopic No
Solubility g/100gH₂0 N/A
CdWO4 Scintillation Crystals
- Further Reading/Publications -
CdWO4 Scintillation Crystals
- Sizes -
Diameters:
80mm max.
Lengths:
100mm max.