Cadmium tungstate (CdWO4 or CWO) is a monoclinic crystal with a wolframite structure and has good comprehensive scintillation properties. The peak scintillation wavelength of CdWO4 crystal is 480 nm (with emission range between 380-660 nm), and the efficiency is 13000 photons/MeV, when it is hit by gamma rays and x-rays. Because of high luminous efficiency, short afterglow time, large X-ray absorption coefficient, strong resistance to radiation damage, and high material density, CdWO4 crystal is widely used in nuclear inspection, γ camera, X-CT, High energy physics, and container inspection, etc. The combined application of CdWO4 crystal and B4C can form a compact gamma-ray and neutron radiation detector. At the same time, CdWO4 crystals can be used to detect rare nuclear processes, such as double β decay, other rare α, and β decay.
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Technical Parameters
| Crystal Structure | Monoclinic structure |
| Lattice Constant | a = 5.029 Å ; b = 5.859 Å ; c = 5.074 Å α=γ= 90°, β= 91.47° |
| Density | 7.9g/cm3 |
| Melting Point | 1325°C |
| Moh's Hardness | 4- 4.5 |
| Thermal Expansion Coefficient | 6.39×10 -6 /k @<100>; 1.09×10 -5 /k @<010> |
| Refractive Index | 2.3 @ 633nm ( room temperature ) |
| Size ( mm ) | 10x10mm , 5x5mm |
| Thickness | 0.5mm , 1.0mm |
| Polishing | Single-sided or double-sided |
| Crystal Orientation | <010>, <100> |
| Crystal Plane Orientation Accuracy | ±0.5° |
| Color and Appearance | Yellow to colourless depend on annealing |
| Package | Class 100 clean bag, Class 1000 super clean room |
