Electron multiplier dynode d, consisting of two half - dynodes d, d 'in parallel, the same electrical potential v, and having the form of metal sheets 10, 20 pierced with holes 11, 21. According to the invention, the second half - dynode d ′, said half - dynode transmitter, is covered with a material 25 secondary emission, the multiplication of the incident electrons 30 occurs on the surface 23 of the said metal sheet 20, and in that said emitting half - dynode d ′ and the first half - dynode d, namely half - dynode extracting, are offset between them. / p & & p & application of the photomultiplier tubes.
展开▼
