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Well-Type NaI(Tl) Crystals and Detectors

  • High light output 
  • High detection efficiency especially for efficiently detecting low-level radiation
  • Encapsulated in aluminium housing
  • NaI(Tl) crystals integrated with PMT available
  • Main Applications: GAMMA ray detecting systems in radiation medicine, gamma cameras in measuring environmental radiation including from nuclear reactors
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Basic Properties:

Density(g/cm3) 3.67 Melting Point (K) 924
Cleavage Plane <100> Hardness(Mohs) 2
Hygroscopic yes Refractive Index at Emission Peak 1.85
Emission Peak Wavelength (nm) 415 Decay Time (ns) 250
Light Yield (photons/KeV) 38

Sodium Iodide crystals doped with Thallium (or NaI(Tl) crystals) have a very high scintillation or luminescence efficiency and a good energy resolution, NaI(Tl) scintillators has the largest light-out and an emission range well matched to photomultipliers with bialkali photocathodes at a high efficiency, and combination with its easy availability of variety size and geometries and low cost, NaI(Tl) scintillators has become most widely used scintillators. NaI(Tl) crystals is a kind of highly hygroscopic materials, it must be put in a hermetical sealing housing in using.

The well type NaI(Tl) scintillator is a gamma ray detector with a cylindrical part (or a well) that is fabricated concentrically in a cylindrical NaI(Tl) crystal, then the well-type NaI(Tl) crystals is encapsulated in an aluminium housing. For measuring, specimen could be put in the well part and emitted scintilating light would be obtained from the optical window on the top. This well shaped design is especially useful for detection of low-level radiation.  Hangzhou Shalom EO offers the customized well type NaI(Tl) scintillation crystals upon customer's request, and the Photomultiplier Tube (PMT) and electronics could be integrated if required .