NaI(Tl) Scintillation Crystal

Thallium-doped sodium iodide (or NaI(Tl)) crystal scintillator has a very high luminescence (scintillation) efficiency and is available in a wide variety of sizes and geometries that makes it the most widely used scintillator.  NaI(Tl) produces one of the highest signals in a PMT per amount of radiation absorbed.

Application

1 ) Environmental monitoring

2 ) Oil and gas exploration – well logging

3 ) Nuclear physics

4 ) Industrial – Thickness or density gauging, coal / mineral assy

Features

1 ) High light output

2 ) No significant self absorption of scintillation light

3 ) Emission spectrum well matched with the sensitivity curve of photomultiplier tubes (PMTs) with bialkali photocathodes

4 ) Available in single crystal & polycrystalline form

Properties

Density [g/cm3]

3.67

Melting point [K]

924

Thermal expansion coefficient [C-1]

47.7 x 10-6

Cleavage plane

<100>

Hardness (Mho)

2

Hygroscopic

Yes

Wavelength of emission max. [nm]

415

Refractive index @ emission max

1.85

Primary decay time [ns]

250

Light yield [photons/keVγ

38

Temperature coefficient of light yield

0.3%C-1