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      1. Home
      2. Products
      3. Radiation Detection
      4. Crystal Scintillation
      5. Crystal Scintillation Materials
      6. NaI(Tl) Sodium Iodide

      NaI(Tl) Scintillation Crystals

      Sodium Iodide scintillation crystal

      Sodium Iodide crystals have a very high luminescence (scintillation) efficiency and are available in a wide variety of sizes and geometries that makes it the most widely used scintillator.  Thallium-doped Sodium Iodide produces one of the highest signals in a PMT per amount of radiation absorbed. It is second only to our Lanthanum Bromide scintillator. Under optimum conditions, an average of 1x 104 photoelectrons are produced per MeV gamma rays.

      POLYSCIN® NaI(Tl) scintillation crystals are widely recognized as suitable alternatives to single-crystal scintillators in many applications where thermal and mechanical shock are encountered, such as oil and gas exploration. This crystal offers ruggedness combined with a scintillation performance identical to single-crystal NaI(Tl).

       

       

      Uses/Applications

      NaI(Tl) crystals are widely used for radiation detection: 

      • Medical - SPECT (gamma camera), whole-body counting, radioimmunoassay (RIA)
      • Security - Thermal neutron activation
      • Industrial - Thickness or density gauging, coal/mineral assy
      • Oil and gas exploration - well-logging
      • Environmental monitoring
      • Aerial survey
      • Nuclear physics
       

      Features/Benefits

      • High light output
      • Available in single-crystal & polycrystalline form
      • No significant self-absorption of scintillation light
      • Emission spectrum well matched with the sensitivity curve of photomultiplier tubes (PMTs) with bialkali photocathodes

       

      Packaging Options

      NaI(Tl) is hygroscopic and must be hermetically packaged. The proper packaging and integration of scintillation crystals is a science combining advanced design and engineering skills with proven assembly techniques and materials to produce stable, high-resolution radiation detectors.  Saint-Gobain Crystals offers a variety of detector designs to fulfill most radiation counting applications: a packaged scintillator, a scintillator integrated (permanent or demountable) with a light-sensing device [such as a photomultiplier tube (PMT) or silicon photomultiplier (SiPM)], and a detector with low energy entrance window. Each of those standard detector configurations can be designed with one or more of the various options listed plus integrated electronics.

      Visit our Standard Design Product List where you can download detector sales drawing.

      Typical Sizes

      • Cylindrical: 1" diameter x 1" thick, 2" diameter x 2" thick, 3" diameter x 3" thick, 5" diameter X 5" thick
      • Rectangular: 2"x4"x16", 4"x4"x16
      • Camera plates: 24" x 18" x 0.375" thick
      • Pixellated arrays for use with PMTs or PSPMTs

      Visit our Standard Design Product List where you can download detector sales drawing.

      Properties

      Properties Value
      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

       

      Related Resources

       Sodium Iodide Material Data Sheet
       Efficiency Calculations Brochure
       Scintillation Materials and Assemblies

       Contact us to learn more!

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