Scintillation Crystals and Detectors: NaI (Tl)

Scintillation Crystals and Detectors: NaI (Tl)


Scintillation Crystals and Detectors: NaI (Tl)

Sodium Iodide doped with thallium (NaI(Tl)) is a popular scintillation crystal used in detectors for gamma spectroscopy and medical imaging applications such as SPECT (Single Photon Emission Computed Tomography). It has high light output, good energy resolution, and is relatively inexpensive compared to other scintillators. NaI(Tl) has a high stopping power for gamma rays, making it well-suited for detecting low-energy gamma radiation. It is also relatively easy to grow large, high-quality crystals of NaI(Tl) using the Bridgman method. However, it is sensitive to temperature and moisture, and its light output may deteriorate over time.

NaI (Tl)
Crystal structure cubic
Lattice constant( Å ) 6.46
Melting point, °C 924
Density, g/cm3 3.67
Mohn hardness 2
Thermal expansion, 10-6/K 47.4
Refractive index 1.85
Emission wavelength (nm ) 410
Decay constant (ns ) 230
Radiation length (cm ) 2.9
Hygroscopic yes
Afterglow % at 6ms 0.5 - 5.0
Effective atomic number
Light yield [photons/MeVy] 38 x 103
Background, pulse/sec/kg
< 3.0
Crystal cleavage plane (100)

Order Form

Drag and drop files here or Browse
*You can upload your specification file here. Max 5MB. Allowed File Types: JPG, PNG, PDF

About Semiconductor Electronics

SEMI EL project is a global supplier of materials, equipment, spare parts and supplies for the semiconductor industry.

Learn more...

Get In Touch


Join Our Community

Sign up to receive email for the latest information.