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  Thalliuim Doped Sodium Iodide
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Thalliuim Doped Sodium Iodide 
Thallium Doped Sodium Iodide - Nal(TI) - is the most widely used scintillation material. It is traditionally the product of choice in nuclear medicine, environmental monitoring, nuclear physics, aerial surveying, well logging and many other applications familiar to Accina. 
Nal:TI offers these advantage:
greatest light output
convenient emission range
maximum efficiency region of photomultiplier-(PMT)-with bialkali
the possibility of large-size crystal production
low price