CSI Scintillation Crystal Cesium Iodide

Cesium iodide CsITl, 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 NaITl. In contrast, cesium iodide activated by sodium CsINa features a sodium-activated emission peak at 420 nm and a higher light output 85% of NaITl. 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.



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





CsITl 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, CsITl 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 CsITl is slightly hygroscopic, therefore, proper encapsulation is essential to minimize moisture exposure and maintain long-term stability and performance

 

Advantage of CSI Crystal:



High density



Compatible with photodiode readout



Have a light emission at 550 nm



Relatively bright - emits 54,000 photons/MeV 45% of NaITl



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



Application of CSI Crystal?



Radiation detection



Security and Industrial Inspection



Medical CT