Photomultiplier tube having a high first dynode is stackable and a multiplier dynodes

摘要

Photomultiplier tube 10 comprising a photocathode 20, a first dynode 30 and a device 40 laminated multiplier dynodes which can be stacked. According to the invention, the first dynode 30 is constituted by a plate parallel to the photocathode 20 and provided with a hole 31 of the passage, the extracting grid 32 at the same potential as the first dynode 30 being disposed between the photocathode 20 and the said plate and the device 40 laminated multiplier dynodes which can be stacked is placed facing the hole 31 so as to collect the secondary electrons emitted by the first dynode 50 30 and passing through the hole 31. / p & & p & application of the photomultiplier tubes of a collection.