Scintillation Crystals and Detectors: CsI (Tl)

Scintillation Crystals and Detectors: CsI (Tl)


Scintillation Crystals and Detectors: CsI (Tl)

CsI (Tl) is another scintillation crystal used for detecting gamma rays, X-rays, and high-energy particles. It is composed of cesium iodide (CsI) doped with thallium (Tl) impurities, which create electron-hole pairs when gamma rays or other particles interact with the crystal. The resulting light is then detected by a photomultiplier tube or other detector. CsI (Tl) is highly efficient at detecting gamma rays and has good energy resolution, making it a popular choice for applications such as medical imaging and nuclear physics research.

CsI (Tl)
Crystal structure cubic
Lattice constant( Å ) 4.566
Melting point, °C 894
Density, g/cm3 4.51
Mohn hardness 2
Thermal expansion, 10-6/K 50
Refractive index 1.79
Emission wavelength (nm ) 560
Decay constant (ns ) 1000
Radiation length (cm ) 1.86
Hygroscopic yes
Afterglow % at 6ms 0.05 - 5.0
Effective atomic number
Light yield [photons/MeVy] 52- 56 x103
Background, pulse/sec/kg
< 3.0
Crystal cleavage plane none

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