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Tl in NaI

  1. May 23, 2008 #1
    Hello.

    I was wondering what's the purpose of using Thallium (Tl) in Iodine Sodium (NaI) scintillators.
     
  2. jcsd
  3. May 23, 2008 #2
    Sodium iodide (NaI) in its pure
    state can detect gamma rays only at very low temperatures. By adding a small
    amount of Thallium metal to the crystal (about 0.01%), the crystal can detect
    gamma rays or nuclear particles at much higher temperatures.
     
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