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ALKOR Technologies - your CRYSTAL optics supplier.
Materials>>Scintillation crystals>>CsI(Tl) Scintillation crystals

Scintillator CsI(Tl),CsI(Tl) scintillation crystal, Thallium activated Cesium Iodide

Scintillator CsI(Tl)'s maximum of the broad emission situated at 550nm which allows Si-photodiodes to be used to detect the emission. The use of a scintillator-photodiode pair makes it possible to diminish significantly the size of the detecting system (due to the use of photodiode instead of PMT), to do without high-voltage supply source, and to use detecting systems in magnetic fields. The high radiation resistance (up to 102áGy) allows CsI(TI) to be used in nuclear, medium, radiation detectionáand high-energy physics etc. Special treatment ensures obtaining of CsI(Tl) scintillators with a low afterglow (less than 0.1% after 5 ms) for the use in safety inspection and imaging.

So far we can offer Czochralski method and Bridgman growth crystals to meet different application, it's widely used in High energyáphysics, radiation detection and medical& safety inspection imaging.


Density [g/cm3] 4.51
Melting point [K] 894
Thermal expansion coefficient [K-1] 54 x 10-6
Cleavage plane none
Hardness (Mho) 2
Hygroscopic Slightly
Wavelength of emission maximum [nm] 550
Lower wavelength cutoff [nm] 320
Refractive index at emission maximum 1.79
Primary decay time [Ás] 1
Afterglow (after 6ms) [%] 0.5 - 5.0
Light yield [photons/MeVγ] 52- 56 x103
Photoelectron yield [% of NaI(Tl)] (y rays) 45