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 NaI(Tl) - Sodium Iodide (Tl)


Sodium Iodide (Tl) - NaI(Tl) - is a well established and the most extensively used scintillator. It is used for detecting gamma rays of low and intermediate energies. It has a high level of optical output and relatively inexpensive. It is available in both single crystal and polycrystalline formats.


As a scintillator, NaI(Tl):



Issues to be aware of:



Sodium Iodide (Tl) - NaI(Tl)- is a useful scintillator for applications such as:







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Properties

Optical

Units

Value

Wavelength (Max. Emission)

nm

415

Lower Wavelength Cut-off

nm

300

Decay Time

ns

230

Light Yield

photons/keV

55

Photoelectron Yield

% of NaI(Tl)

100

Radiation Length

cm

2.6

Optical Transmission

µm

0.15 - 12.5

Transmittance

%

>90 (0.35 - 9µm)

Refractive Index


1.85 (415nm)

Reflection Loss/Surface

%

6.8

Sodium Iodide (Tl) - NaI(Tl) Properties


Properties

Mechanical

Units

Value

Density

g/cm³

3.67

Atomic Number (Effective)


56

Melting Point

ºK

924

Thermal Expansion Coeff.

C⁻¹

47.4 x 10‾⁶

Cleavage Plane


<100>

Hardness

Mho

2

Hygroscopic


Yes

Solubility

g/100gH0

TBA (23ºC)

NaI(Tl) Scintillation Crystals - Sizes


Diameters:  Up to TBAmm

Lengths:      Up to TBAmm






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