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			12:39
			Dopants in the Crystal Radio The impurities in the detector crystal in the crystal radio consisted of these different kinds of n- and/or p-type dopants. At the time of the crystal radio the nature of the impurities were not known. Although the radio users didn't understand the theory behind the phenomenom of rectification, they used it in practice when they tried to find one of the "magic spots," where rectification occurred.

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