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      BaF2 Barium Fluoride

      BaF2 Barium Fluoride

      Barium fluoride (BaF2) has an emission component with subnanosecond decay time that yields very fast timing. It is a scintillator showing two wavelengths of emission (310 nm and 295 nm).  The emission at 220nm has an emission with sub nanosecond decay time interesting for timing applications. Using special electronics, time resolutions around 200 ps are possible for small detector geometries.

      There are several other scintillators that also have excellent timing capabilities. These are BrilLanCeTM 380 and 350 (LaBr3:Ce and LaCl3:Ce) and LYSO scintillators.

       

       

      Uses/Applications

      • Nuclear Physics - capture of fast events
       

      Features/Benefits

      Fast Timing for:
      • Positron Lifetime Studies
      • Time of Flight Measurements
      • Positron Emission Tomography (PET)
      • Certain High-energy Physics Applications

       

      Packaging Options

      To detect the fast scintillation light, it is necessary to use a photomultiplier tube with a quartz entrance window. Furthermore, the optical coupling compound must have a good transparency for UV light. BaF2 is not hygroscopic, but condensing moisture can pit its surface. It is relatively radiation hard.

      Typical Size

      small cross-sections; 1"x1", 1.5"x1.5", 2"x2"

      Properties

      Properties Value
      Density [g/cm3] 4.88
      Melting point [K] 16.27
      Thermal expansion coefficient [C-1] 18.4 x 10-6
      Cleavage plane <111>
      Hardness  (Mho) 3
      Hygroscopic  Slightly
      Wavelength of emission max. [nm] 310 / 220(195)
      Lower wavelength cutoff [nm] 135
      Refractive index @ emission max 150(310nm) 1.54(220nm)
      Primary decay time [ns] 630 (slow) / 0.6-0.8 (fast)
      Light yield [photons/keVγ] 10 (slow)  / 1.8 (fast)
      Photoelectron yield [% of NaI(Tl)] (for γ-rays) 16 (slow) / 3 (fast)

      Related Resources

       Barium Fluoride Data Sheet
       Efficiency Calculations Brochure
       Scintillation Materials and Assemblies

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