Built around your specification

TiO2: >=0.1 mm
BaSO4: >=0.1 mm
Relative light output of NaI(Tl): 30% to 50%
Scintillation decay time: 14000 ns

Final specifications and acceptance criteria are confirmed for the quoted configuration.

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Overview

CdWO4 Scintillator Array for CT Imaging and Security Inspection

CdWO4 Array is a cadmium tungstate scintillator array used in industrial computed tomography, medical CT, security inspection and high-energy radiation imaging systems. CdWO4 combines high density, high atomic number, low afterglow and good radiation resistance, making it suitable for X-ray and gamma imaging applications where image lag must be controlled.

ATR Crystal supplies custom CdWO4 linear arrays and 2D pixel arrays. Common formats include 1×8, 1×16, 1×32, 1×64 linear arrays and 6×10, 12×18, 24×36 two-dimensional arrays. Pixel size, reflector material, reflector thickness, array pitch, polishing, optical coupling and housing can be reviewed according to detector design.

TiO2 and BaSO4 reflector options are available, with reflector material plus adhesive typically >=0.1 mm. The listed minimum pixel size is 0.3 mm x 1 mm, subject to array geometry, saw kerf, reflector filling and handling requirements.

Advantages of CdWO4 Array

Low afterglowThe listed afterglow is <0.01% at 20 ms, useful for CT and scanning systems.
High density and high atomic numberCdWO4 provides strong X-ray and gamma stopping power for imaging applications.
Good radiation resistanceCdWO4 is widely used where long-term radiation exposure must be considered.
No intrinsic radioactive backgroundCdWO4 is useful in applications where intrinsic scintillator background should be low.
Custom pixel geometryLinear and 2D arrays can be reviewed with custom pitch, pixel size and reflector.
Non-hygroscopic materialCdWO4 does not require hermetic sealing for moisture protection like NaI(Tl).

Specifications

Specifications of CdWO4 Array

Array Item	Typical Option	Notes
Linear array	1×8, 1×16, 1×32, 1×64 and custom formats	Used for line-scan and CT detector modules.
2D array	6×10, 12×18, 24×36 and custom formats	Pixel count and pitch can be reviewed by drawing.
Minimum pixel size	0.3 mm x 1 mm	Subject to geometry, reflector and processing feasibility.
Reflector	TiO2 or BaSO4	Selected according to optical isolation, reflectivity and process requirement.

Reflector Types and Thicknesses of CdWO4 Array

Material	Thickness of Reflector Material + Adhesive
TiO2	>=0.1 mm
BaSO4	>=0.1 mm

Properties of CdWO4 Crystal

Property	Typical Value
Relative light output of NaI(Tl)	30% to 50%
Scintillation decay time	14000 ns
Emission peak wavelength	475 nm
Refractive index at peak wavelength	2.3
Density	7.9 g/cm3
Hygroscopic	No
Mohs hardness	4.5
Afterglow	<0.01% at 20 ms
Cleavage plane	<010>
Radiation length	1 cm
Light yield	12 to 15 photons/keV

CdWO4 Array vs. Related Scintillator Arrays

Array Material	Main Advantage	Best Fit	Design Notes
CdWO4	Low afterglow, high density and radiation resistance	CT, security inspection and X-ray scanning	Decay is slow, but image lag performance is useful for scanning systems.
BGO Array	High density and high-Z stopping power	High-energy gamma and PET-related detector arrays	Lower light yield than many scintillators.
CsI(Tl) Array	High light yield and good photodiode matching	X-ray imaging and detector modules	Afterglow and decay behavior should be reviewed.
LYSO(Ce) Array	Fast decay and high density	PET and timing-sensitive detectors	Contains lutetium intrinsic background.

Applications

Applications of CdWO4 Array

Industrial computed tomography scanners
Medical computed tomography detector modules
Security inspection for luggage, containers and vehicles
High-energy physics detector arrays
X-ray imaging and line-scan detectors
Custom linear and 2D scintillator array modules

Ordering

CdWO4 Array RFQ Checklist

RFQ Item	Information to Provide
Application	Industrial CT, medical CT, security inspection, line scan, high-energy physics or custom detector.
Array geometry	Linear or 2D array, pixel count, pixel size, pitch, total size and drawing.
Reflector	TiO2, BaSO4, reflector thickness, optical isolation and cross-talk requirement.
Optical processing	Surface finish, polishing, coupling face, backing and sensor interface.
Quality target	Dimensional tolerance, light output uniformity, cross-talk, defects and inspection report.
Order information	Prototype quantity, batch quantity, packaging and delivery schedule.

Frequently Asked Questions

What is CdWO4 array used for?

CdWO4 arrays are used for industrial CT, medical CT, security inspection, X-ray scanning and high-energy detector modules.

What is the minimum pixel size?

The listed minimum pixel size is 0.3 mm x 1 mm, subject to array geometry, reflector and processing feasibility.

What reflector materials are available?

The listed reflector options are TiO2 and BaSO4, both with reflector material plus adhesive thickness >=0.1 mm.

Is CdWO4 hygroscopic?

No. CdWO4 is non-hygroscopic, which simplifies handling compared with hygroscopic scintillators such as NaI(Tl).

What test details are needed for a CdWO4 array afterglow requirement?

Specify the excitation conditions, the delay after excitation ends, and how residual output is calculated. Include the intended exposure sequence and readout integration interval when they affect the application. A general low-afterglow description does not define an acceptance test; ask which measurement conditions and limits can be confirmed for the quoted array.

Which faces should be identified on a CdWO4 array drawing?

Identify the radiation-entry face, optical readout face and any backing or mounting face separately. Dimension the crystal length along the intended radiation path and mark the surfaces that require polishing or reflector coverage. If the sensor couples to a different face than expected from the top view, add a section drawing to make that interface clear.

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