# What is typical values of impurity concebtration to change band stucture?

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Hello,

I am interesting in researching of impurities affect on dos

and band structure. Maybe someone can help me with a start point, and answer on my questions:

1. What is the minimum concentration of impurities (for scintillators) shous be, to affect dos and band structure?

2. What is the maximum number of impurities, when people stop to consider they as inpurities, but as the complete structure?

Thanks

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