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Sodium Iodide Nal (TI)
Scintillation Crystal Detectors

NaI (Tl) is a super performance scintillation crystal. The crystal is grown from pure NaI raw material doped with thallium. The maximum emission is up to 415nm, which is well matched to the sensitivity curve of photomultiplier tubes (PMTs) with bialkali photocathodes.

The material has very high luminescence efficiency, and exhibits no significant self absorption of the scintillation light and has good resolution ability to Xray and γ‐ray.

NaI (Tl) crystals are widely used in Military application, Oilfield exploration, Metallurgy, Social security, Environmental control, Medical detection, Physical research, etc.


Main Properties

Density 3.67 g/cm3
Mohs hardness 2.1
Melting point 651℃
Thermal expansion coefficient 47.4 x 10-6 K-1
Cleavage plane (100)
Light yield 38 x 103 Photons / MeV γ
Wavelength of emission maximum 415 nm
Primary decay constant 250 ns
Refractive index at emission max. 1.85


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