CdWO4 Scintillation Crystal
ATR Crystal supplies custom CdWO4 (cadmium tungstate) scintillation crystals for X-ray detection, CT scanning and security inspection. Monolithic crystals, linear arrays and 2D arrays can be reviewed according to your drawing. Send dimensions, tolerances, polished-face requirements, readout arrangement and quantity for a quotation. Afterglow, light output and acceptance tests are confirmed for the quoted configuration.
Built around your specification
- Listed maximum size
- Diameter 80 mm x length 200 mm
- Available formats
- Monolithic crystal, linear or 2D array
- Relative light output vs NaI(Tl)
- 30%-50% with a bialkali PMT
- Scintillation decay time (ns)
- 14,000
Final specifications and acceptance criteria are confirmed for the quoted configuration.
Request a quotationOverview
CdWO4 Scintillation Crystals for X-Ray and CT Detection
CdWO4 scintillation crystal, also called cadmium tungstate or CWO, is a dense, non-hygroscopic material used in X-ray detection, computed tomography and security inspection. Its light output and low-afterglow characteristics are relevant to imaging systems using silicon photodiode readout.
ATR Crystal supplies custom monolithic CdWO4 crystals and linear and 2D CdWO4 scintillator arrays. Send your drawing, dimensions, surface requirements and readout arrangement so we can review the proposed configuration.
Material selection should account for both the radiation absorption requirement and the detector response. The listed decay time is 14,000 ns, so CdWO4 should be evaluated carefully when fast timing or high count-rate performance is required. For a broader comparison, see our scintillation crystal selection guide.
CdWO4 Material Selection Notes
- High-density materialThe listed density is 7.9 g/cm3. Select the crystal thickness for the radiation energy and absorption requirement.
- Afterglow evaluationThe listed reference is less than 0.01% at 20 ms. Agree the excitation, measurement time and acceptance method for the quoted material.
- Photodiode readoutReview the sensor response at the emission wavelength, optical coupling and light collection geometry.
- Custom geometryMonolithic crystals and arrays can be reviewed from drawings. Confirm dimensions, tolerances and finished optical surfaces during quotation.
Specifications
CdWO4 Scintillation Crystal Specifications
Listed Formats and Material Properties
| Parameter | Listed Value / Option |
|---|---|
| Listed maximum size | Diameter 80 mm x length 200 mm |
| Available formats | Monolithic crystal, linear or 2D array |
| Relative light output vs NaI(Tl) | 30%-50% with a bialkali PMT |
| Scintillation decay time (ns) | 14,000 |
| Emission peak wavelength (nm) | 475 |
| Refractive index at emission peak | 2.3 |
| Density (g/cm3) | 7.9 |
| Hygroscopicity | Non-hygroscopic |
| Mohs hardness | 4.5 |
| Afterglow | <0.01% at 20 ms |
| Radiation length (cm) | 1.0 |
| Light yield (photons/keV) | 12-15 |
14,000 ns equals 14 microseconds. Relative light output measured with a bialkali PMT and material photon yield are different quantities; the signal obtained with a photodiode also depends on sensor response and optical collection.
These values are material references. Confirm the finished dimensions, feasible geometry, required tests and acceptance criteria for the proposed order. The maximum size is a capability reference and does not establish availability for every shape or quantity.
CdWO4 vs CsI(Tl) and BGO
For CT and X-ray scanning, compare afterglow under the same measurement conditions as well as light output, absorption, handling and readout requirements.
| Material | Density (g/cm3) | Listed Decay Time (ns) | Selection Considerations |
|---|---|---|---|
| CdWO4 | 7.9 | 14,000 | Non-hygroscopic material for CT and scanning; confirm afterglow and detector response. |
| CsI(Tl) | 4.51 | 1,000 | Slightly hygroscopic; compare standard and low-afterglow grades for photodiode readout. |
| BGO | 7.13 | 300 | Non-hygroscopic, high-density scintillator; assess light output and readout compatibility. |
Timing-oriented designs may also require a comparison with LYSO(Ce) scintillation crystals. Compare detector measurements at the intended operating conditions rather than selecting a material from decay time alone.
Applications
Applications of CdWO4 Scintillation Crystal
Industrial computed tomography (CT) scanners
Medical computed tomography (CT) scanners
Security inspection
High energy physics
Match crystal thickness, light collection and readout response to the intended radiation spectrum and measurement conditions. A material property alone does not determine the resolution or image lag of a complete imaging system.
Ordering
CdWO4 Crystal Quotation Requirements
For a quotation, please provide:
- Crystal or array format, finished dimensions, tolerances and quantity.
- A dimensioned drawing showing polished faces and optical interfaces.
- Application, radiation energy range and photosensor or readout arrangement.
- For arrays: pixel size, pitch, channel count, reflector and overall dimensions.
- Required afterglow, light-output or other performance tests, with measurement conditions.
- Packaging requirements and the operating environment.
Use the CdWO4 crystal quotation form below to send the information you have. Final supply scope, inspection methods and acceptance criteria are confirmed during quotation.
Frequently Asked Questions
Can you supply CdWO4 arrays as well as single crystals?
State the required construction explicitly. For an array, give pixel count, pixel dimensions, pitch and separator requirements; for a monolithic crystal, provide the single-piece geometry and surface map. Matching the outside dimensions does not make the two constructions equivalent. Identify the sensor layout and optical interface before comparing quotations.
How should afterglow be specified for CT applications?
Which surfaces should be polished?
Can a CdWO4 material light-output value be used directly as a photodiode signal specification?
No. Specify the photodiode model, active area, optical coupling and measurement conditions for the signal you need. The relative light-output reference measured with a PMT is a different quantity from the electrical signal produced by a photodiode. Identify whether the acceptance limit concerns the crystal alone or the crystal in a defined readout assembly.
Request a quotation
Send your application and specification requirements directly from this page.
Prefer email? Send your drawing or specification sheet to:
sales@atrscintillator.com