A @P04612@ inside an evacuated envelope with a transparent window, the photocathode, and the @A00370@. The photocathode can be opaque or semitransparent.
Source: PAC, 1995, 67, 1745. (Nomenclature, symbols, units and their usage in spectrochemical analysis-XI. Detection of radiation (IUPAC Recommendations 1995)) on page 1752 [Terms] [Paper]
Citation: 'vacuum phototube' in IUPAC Compendium of Chemical Terminology, 3rd ed. International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. https://doi.org/10.1351/goldbook.V06586 RISBibTexEndNote