CdWO4 Scintillation Detector

CdWO4 Scintillation Detector
Product Details

Cadmium tungstate CdWO4 (CWO), due to its low intrinsic background and afterglow together with sufficiently high light yield, is the most promising for spectrometry and radiometry of radio nuclides under extremely low activities, and also for computer tomography.

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 μs). 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 (μs)

12-15

Peak emission (nm)

480

After glow

0.1%@6ms

Density (g/cm3)

7.9

Hygroscopicity

No

 

Polishing Specification for Optical Grade

 

Standard    Precision

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

<λ-2λ

<λ/2-λ/4

λ/4-λ/6

Wavefront Distortion

<(2-4)λ

<(1-2)λ

<(λ-λ/2)

Surface Quality

60/40

40/20

20/10

Parallel

45〞

10ˊ

Perpendicular

60ˊ

30ˊ

20ˊ

Clear Aperture

>90%

Chamfer

<0.2mm×45°

Coating

Available upon request

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