Cesium iodide (CsI(Tl)), activated by thallium, is one of the most efficient scintillators discovered so far. CSI Crystal exhibits thallium-activated luminescence with an emission peak at 550 nm and a light output of 45% relative to NaI(Tl). In contrast, cesium iodide activated by sodium (CsI(Na)) features a sodium-activated emission peak at 420 nm and a higher light output (85% of NaI(Tl)). Both materials share properties such as deliquescence, soft and plastic mechanical behavior, radiation resistance, high-temperature tolerance, and fast timing characteristics (for pure CsI). They are widely used in particle detection for high-energy physics experiments, medical SPECT imaging, baggage/container security inspection, industrial level sensing and non-destructive testing, and cosmic ray research in space physics.
Application of CSI Crystal : Radiation detection、Security and Industrial Inspection、Medical CT
Specification Parameter
| Properties | Value | Unit |
| Density | 4.51 | g/cm³ |
| Melting point | 894 | K |
| Hardness | 2 | Mohs |
| Refractive index | 1.79 | |
| Light yield | 56000 | Photon/Mev |
| Decay Constant | 1020 | ns |
| Wavelength of emission max. | 550 | nm |
| Afterglow (after 30ms) | 0.5-0.8 | % |
| Hygroscopic | slight |
CsI(Tl) scintillator (Cesium Iodide) delivers high light output, excellent detection sensitivity, and good energy resolution, making it a preferred choice for radiation detection and medical imaging applications, including CT scans, SPECT imaging, and other diagnostic modalities. Its strong gamma-ray stopping power also makes it ideal for security screening in airports, customs, and critical infrastructure facilities.
With an emission peak around 550 nm, CsI(Tl) is well matched to photodiode readout systems, ensuring efficient light collection and optimal system performance.
CSI Crystal offers good mechanical strength and excellent machinability, allowing it to be fabricated into a wide range of shapes and sizes. EBO provides customized solutions, including linear and two-dimensional scintillator arrays, tailored to specific detector configurations.
It should be noted that CsI(Tl) is slightly hygroscopic, therefore, proper encapsulation is essential to minimize moisture exposure and maintain long-term stability and performance
High density
Compatible with photodiode readout
Have a light emission at 550 nm
Relatively bright - emits 54,000 photons/MeV (45% of NaI(Tl))
Absorber with good stopping power - density 4.51 g/cm³, effective Z of 54
Broad emission, peak at 550nm, ideal for use with photodiodes
Rugged, with good mechanical properties
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