Cesium Iodide doped with Thallium (CsI:Tl) is a widely used inorganic scintillation crystal. Boasting a density of 4.51 g/cm³ and a light yield reaching 45% of NaI:Tl, it features an emission peak at 550 nm that matches well with silicon photodiodes. With low afterglow, excellent radiation hardness and non-cleavable structure, it serves as a key component in security screening, high-energy physics experiments and ind...
Cesium Iodide doped with Thallium (CsI:Tl) is a widely used inorganic scintillation crystal. Boasting a density of 4.51 g/cm³ and a light yield reaching 45% of NaI:Tl, it features an emission peak at 550 nm that matches well with silicon photodiodes. With low afterglow, excellent radiation hardness and non-cleavable structure, it serves as a key component in security screening, high-energy physics experiments and industrial non-destructive testing.
OST Photonics provides customized solutions for CsI(Tl) scintillation products, including bulk crystals, scintillation screens, as well as linear and 2D arrays, tailored to meet specific customer requirements. We also offer low-afterglow CsI(Tl) crystals with an afterglow range of 0.05% to 0.39% measured at 20ms. These specialized crystals preserve the high light yield characteristic of standard CsI(Tl) variants while drastically suppressing afterglow effects. This effectively eliminates image trailing caused by afterglow in scanning radiation imaging systems, significantly enhancing imaging clarity and resolution. As such, they are ideally suited for high-performance imaging applications demanding superior image quality and rapid scanning capabilities.
Medical X-ray & CT Imaging
High Energy Nuclear Physics
Nuclear Security & Inspection
Geological Exploration
Astronomical Observation
High light yield
Emission peak at 550 nm: Matches ideally with silicon photodiodes and CCDs
Low afterglow
High density (~4.51 g/cm³)
Mechanical robustness
Maximum Size: ɸ120mm x 400mm
Available items: monolithic crystal, scintillation screen, linear or 2-D array
Type | Relative Light Output of NaI(Tl) | Decay time | Afterglow |
Standard type | 45% | 1000 ns | 0.5~5%@6ms |
Low afterglow type | 40% | 1000 ns | 0.05~0.39%@20ms |
Relative Light Output of NaI(Tl) (%) | low afterglow type: 40; standard type: 45% |
Scintillation Decay Time (ns) | 1000 |
Emission Peak Wavelength (nm) | 550 |
Refractive Index (peak wavelength) | 1.80 |
Density（g/cm3） | 4.51 |
Hygroscopic | Slight |
Mohs hardness | 2 |
Afterglow | low afterglow type: 0.05~0.39%@20ms; standard type: 0.5~5%@6ms |
Light yield (photons/keV) | low afterglow type: 48; standard type: 54 |
The following specifications are listed on our original catalogue. Custom dimensions, orientations and surface finishes are produced to your drawing.
Send us your dimensions, orientation, surface finish and quantity. Our engineers reply with a technical proposal and price.
