CsI (Cesium Iodide) Crystal Scintillators for Nuclear Spectroscopy
Cesium iodide (CsI) crystal scintillators provide reliable performance in gamma-ray detection and nuclear spectroscopy applications. Available in a wide range of sizes, shapes, and form factors, these scintillators support both single-detector and array-based configurations.
Key Properties of CsI Crystal Scintillators
- Mechanical Durability: Resistant to cleavage and cracking under mechanical stress, making it suitable for portable and field-deployed instruments.
- Low Hygroscopicity: Minimally sensitive to moisture compared to many other halide scintillators, simplifying handling and encapsulation.
- Bright Emission & Spectral Match: Peak emission above 500 nm, well-suited for readout with silicon-based photodetectors such as silicon photomultipliers (SiPM) or photodiodes.
- Good Resolution & Efficiency: Delivers consistent energy resolution for gamma spectroscopy across a broad energy range.
CsI crystal scintillators are offered encapsulated for protection, integrally coupled to light sensors (PMT, SiPM, or photodiode), or as complete detector assemblies with front-end electronics.
Properties of CsI(Ti) Scintillators
Density (g/cm3)
4.51
Melting point (K)
894
Thermal expansion coefficient (C-1)
54 x 10-6
Cleavage plane
None
Hardness (Mohs)
2
Hygroscopic
Slightly
Wavelength of emission max. (nm)
550
Lower wavelength cutoff (nm)
320
Refractive index @ emission max
1.79
Primary decay time (ns)
1000
Light yield (photons/keV)
54
Photoelectron yield (% of NaI(Tl)) (for γ-rays)
45
Properties of CsI(Na) Scintillators
Density (g/cm3)
4.51
Melting point (K)
894
Thermal expansion coefficient (C-1)
54 x 10-6
Cleavage plane
none
Hardness (Mohs)
2
Hygroscopic
Yes
Wavelength of emission max. (nm)
420
Lower wavelength cutoff (nm)
300
Refractive index @ emission max
1.84
Primary decay time (ns)
630
Light yield (photons/keV)
41
Photoelectron yield (% of NaI(Tl)) (for γ-rays)
85
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