Description
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.
Properties/crystal | 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 | 54 |
Light yield [photons/MeVy] | 52- 56 x103 |
Background, pulse/sec/kg | < 3.0 |
Crystal cleavage plane | none |
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