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photomultiplier tubeOne entry found. Main Entry: pho·to·mul·ti·pli·er tube Pronunciation: \ˌfō-tō-ˈməl-tə-ˌplī(-ə)r-\ Function: noun Date: 1941 : a vacuum tube that detects light especially from dim sources through the use of photoemission and successive instances of secondary emission to produce enough electrons to generate a useful current —called also photomultiplier
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