FIELD: electric discharge tubes or lamps. SUBSTANCE: multilayer emitter for secondary-emission radio-isotope current supply is built up of alternating semiconductor material and metal layers 4 and 5, respectively. Layers 4 and 5 are electrically insulated by means of insulating screens 6 or vacuum gaps 7 forming emitters 3 arranged on both sides of radio- isotope 2. Layers 4 are interconnected by conductors 8 to form positive lead 9 of current supply; layers 5 are interconnected by conductors 10 to form negative lead 11 of current supply. EFFECT: improved design. 3 cl, 1 dwg
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