What is the role of Thallium in NaI scintillators?

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Hello.

I was wondering what's the purpose of using Thallium (Tl) in Iodine Sodium (NaI) scintillators.
 
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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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