Electron multiplier having dynode modules

Claim 1

An electron multiplier comprising: a plurality of pairs of successive longitudinally disposed electron multiplier dynodes, a plurality of successive longitudinally disposed spaced parallel insulating support discs having centrally disposed openings, each disc supporting a complementary pair of said dynodes in said opening arranged to direct electrons from one dynode of said pair to the other, each said disc including a plurality of like apertures spaced around the periphery thereof and a plurality of hollow metal connecting posts mounted on each said disc and having an end extending from said apertures on one side of each said disc, said apertures and posts of each disc being aligned with said apertures and posts of each other disc, each said end extending the distance between discs to abut the opposite side of the next adjacent support disc, each pair of dynodes on each respective disc being connected between a selective pair of said posts different from each other disc, and a plurality of lead wires passing through the respective aligned apertures and posts and connecting said plurality of aligned posts of successive discs together in a predetermined pattern for establishing progressively increasing potentials on successive dynodes, including two voltage dividing resistors printed on said support disc and connected between each said dynode and a respective post on each said disc wherein one end of each of said resistors is connected to a respective post, the other ends of both of said resistors being connected to one of said dynodes, the other of said dynodes being connected to one of said posts, said successive pairs of dynodes being arranged in alignment for directing a stream of electrons from each pair through successive said pairs.