The crystal is transparent and emits light when it is hit by gamma rays and x-rays, making it useful as a detector of ionizing radiation. Its peak scintillation wavelength is 480 nm (with emission range between 380-660 nm), and efficiency of 13000 photons/MeV. It has a relatively high light yield, its light output is about 40% of NaI(Tl), but the time of scintillation is quite long (12~15 s). It is often used in computed tomography. Combining the scintillator crystal with externally applied piece of boron carbide allows construction of compact detectors of gamma rays and neutron radiation.
Specifications
| Scintillation Properties | |
|
Materials |
CdWO4 |
|
Light yield (Photon/MeV) |
13000 |
|
Decay time (s) |
12-15 |
|
Peak emission (nm) |
480 |
|
After glow |
0.1%@6ms |
|
Density (g/cm3) |
7.9 |
|
Hygroscopicity |
No |
|
Polishing Specification for Optical Grade |
|||
|
StandardPrecision |
High Precision |
Super Precision |
|
|
Orientation Tolerence |
< 1° |
< 0.5° |
< 0.2° |
|
Thickness/Diameter Tolerance |
±0.10 mm |
±0.05 mm |
±0.02 mm |
|
Surface Flatness@633nm |
<-2 |
</2-/4 |
/4-/6 |
|
Wavefront Distortion |
<(2-4) |
<(1-2) |
<(-/2) |
|
Surface Quality |
60/40 |
40/20 |
20/10 |
|
Parallel |
45 |
1 |
10 |
|
Perpendicular |
60 |
30 |
20 |
|
Clear Aperture |
>90% |
||
|
Chamfer |
<0.2mm×45° |
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|
Coating |
Available upon request |
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