CsI(Na) Scintillation Crystal
ATR Crystal supplies CsI(Na) scintillation crystals, or sodium-doped cesium iodide, with custom geometry and encapsulation reviewed for your application. Its blue emission near 420 nm can suit bialkali PMT readout after the sensor and optical coupling are checked. For a quotation, send crystal dimensions, housing and window requirements, operating conditions and quantity. Final specifications and inspection criteria are confirmed for the quoted configuration.
Built around your specification
- Relative light output, NaI(Tl) = 100%
- 85%
- Scintillation decay time
- 630 ns
- Peak emission wavelength
- 420 nm
- Refractive index at peak emission
- 1.8
Final specifications and acceptance criteria are confirmed for the quoted configuration.
Request a quotationOverview
CsI(Na) Scintillation Crystals for PMT Readout
ATR Crystal supplies sodium-doped cesium iodide scintillation crystals, commonly written as CsI(Na) or CsI:Na, with dimensions, surface finish and encapsulation reviewed against your application. Its blue emission near 420 nm is relevant to bialkali photomultiplier tube (PMT) readout. The sensor response, optical coupling and crystal geometry should be checked together.
CsI(Na) is hygroscopic. Specify the sealed package, optical window and coupling face when requesting an encapsulated crystal. Final light output, energy resolution and environmental performance depend on the finished component and agreed test conditions.
CsI(Na) Crystal Formats and Encapsulation
Send the required crystal shape and finished dimensions, together with a drawing when tolerances, mounting features or optical interfaces are important. For encapsulated CsI(Na) scintillators, distinguish the crystal dimensions from the outside housing dimensions and identify the optical-window aperture.
The size reference is 80 mm diameter × 400 mm length. Finished-size feasibility, tolerances and encapsulation are confirmed for the requested geometry during quotation; this reference is not a standard housing size.
For well-logging or elevated-temperature use, provide sustained and peak temperatures, operating cycles, shock or vibration requirements and the intended sealing arrangement. The crystal, window, seal and optical coupling must be reviewed for the requested environment.
Specifications
CsI(Na) Scintillation Crystal Properties
The following values are material references for initial selection. Specify measurement conditions and acceptance criteria when a property must be verified for your order.
| Property | Typical Reference Value |
|---|---|
| Relative light output, NaI(Tl) = 100% | 85% |
| Scintillation decay time | 630 ns |
| Peak emission wavelength | 420 nm |
| Refractive index at peak emission | 1.8 |
| Density | 4.51 g/cm3 |
| Hygroscopic | Yes |
| Mohs hardness | 2 |
| Afterglow | 0.5–5% at 6 ms |
| Light yield | 41 photons/keV |
The relative-light-output reference uses a bialkali PMT comparison with NaI(Tl); it is not the same quantity as absolute photon yield. For afterglow requirements, state the excitation conditions, measurement delay and signal normalization. Energy resolution should be specified with the radiation energy, photosensor and measurement arrangement.
CsI(Na) vs CsI(Tl) vs NaI(Tl)
Choose the material together with the readout and packaging requirements. Sodium-doped and thallium-doped cesium iodide have different emission spectra and timing; they should not be treated as interchangeable components.
| Material | Typical Emission / Decay | Selection Considerations |
|---|---|---|
| CsI(Na) | 420 nm / 630 ns | Blue emission relevant to bialkali PMT readout; hygroscopic crystal requires moisture protection. |
| CsI(Tl) scintillation crystal | 550 nm / about 1000 ns | Green emission relevant to photodiode readout; review the sensor response and moisture protection. |
| NaI(Tl) scintillation crystal | 415 nm / about 250 ns | Common gamma-spectroscopy material; hygroscopic and requires hermetic encapsulation. |
These are reference values, not a prediction of finished-detector performance. For a broader comparison with other materials, see the scintillation crystal selection guide.
Applications
Applications and Design Notes
Well-logging: review the encapsulated crystal, operating-temperature profile, vibration, shock and optical interface against the instrument requirements.
Nuclear physics: specify the radiation type, energy range, crystal volume and readout geometry.
Environmental monitoring: define sensitivity, background conditions, light collection and the intended measurement method.
Industrial gauging: provide the source energy, beam geometry and counting or measurement requirements for thickness, density or mineral-assay systems.
The 630 ns reference decay time and residual afterglow should be considered when setting the integration window, count-rate requirements or response to changing irradiation. A material value alone does not establish the timing or pile-up performance of the complete instrument.
Ordering
Information Needed for a CsI(Na) Crystal Quotation
Send the application, crystal dimensions and quantity with the drawing or specification you already have. For a sealed package, include the housing and optical-window requirements.
| Requirement | Details to Provide |
|---|---|
| Crystal geometry | Shape, finished dimensions, tolerances and drawing. |
| Encapsulation | Outside housing dimensions, material, mounting, window material and clear aperture. |
| Optical interface | Coupling face, surface finish, reflector and intended PMT or other photosensor. |
| Operating environment | Temperature range, cycles, moisture exposure, shock and vibration requirements. |
| Inspection | Required dimensional checks and defined light-output, energy-resolution or afterglow tests. |
| Quantity and schedule | Prototype or production quantity and requested delivery date for review. |
Use the CsI(Na) crystal inquiry form below, or email your drawing and requirements to sales@atrscintillator.com. Final specifications, inspection scope and supply feasibility are confirmed in the quotation.
Frequently Asked Questions
What is CsI(Na)?
CsI(Na) is sodium-doped cesium iodide, a scintillation material that emits blue light when irradiated. It is also written as CsI:Na.
Does CsI(Na) need encapsulation?
CsI(Na) is hygroscopic. A sealed package protects the crystal from moisture, and the window, seal and mounting arrangement should be specified for the intended environment.
Is CsI(Na) suitable for PMT readout?
Its emission near 420 nm is relevant to bialkali PMTs. Confirm the actual sensor response, active area, optical-window transmission and coupling arrangement before finalizing the component.
Is CsI(Na) interchangeable with CsI(Tl)?
They use different activators and have different emission and decay characteristics. Replacing one with the other requires a review of the photosensor, electronics integration time and optical package.
Can I specify a crystal for elevated-temperature use?
Provide the continuous and peak temperatures, exposure duration, cycling and mechanical requirements. The quoted crystal package must be reviewed for those conditions; a material description alone does not establish a package temperature rating.
Identify the window and coupling arrangement, and state whether the photosensor is included in the temperature-exposed assembly. Ask the quotation to define which components the reviewed operating conditions cover. A crystal or housing temperature requirement should not silently become a rating for a separately supplied sensor or coupling material.
Does a sealed CsI(Na) package dimension specify the active crystal size?
No. List active crystal dimensions and finished housing dimensions separately. Mark the optical window, clear aperture, mounting features and any dimensional limits at the sensor interface. A package may include reflector, clearance and housing layers, so the outer diameter or width should not be used as the active crystal dimension.
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