CdWO4 - Cadmium Tungstate Scintillator Crystal
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 be easily machined into various shapes and geometries
Issues to be Aware Of:
- 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 (10⁸ - 10⁹ rad). Reversible with time or annealing.
Common Applications:
- Positron Emission Tomography (PET)
- Compton suppression spectrometers
- Geological logging
- Specialist applications in high energy, nuclear, space and medical physics
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 |
| Cleavage Plane | Mono | |
| Hardness | Mho | 4 to 4.5 |
| Hygroscopic | No | |
| Solubility | g/100gH₂0 | N/A |
Further Reading/Publications
- Cadmium Tungstate - Wikipedia
- Cadmium Tungstate Scintillators - ScienceDirect
- Scintillator Crystals Overview
- Scintillators Overview
- Contact Us for a Quote
Sizes
| Property | Value |
|---|---|
| Diameters | 80mm max. |
| Lengths | 100mm max. |
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