Abstract: Photomultiplier tube (10) segmented into a plurality of elementary photomultipliers (11), comprising a photocathode (12), a plurality of elementary electron multipliers (13) of the "apertured sheet" type, and a plurality of focusing electrodes (14) providing the convergence of the photoelectrons emitted by the photocathode (12) towards the elementary multiplier (13). In accordance with the invention, the homologous sheets (15) of the elementary multipliers are realised on one single segmented conductor wafer (16) having a neutral zone (17) separating the active apertured zones (18) constituting the different multipliers (13). The said focusing electrodes (14) can be made from one single conductor sheet (19) in which feedthrough apertures (20) are punched through which the photoelectrons are passed towards the elementary multipliers (13).

Abstract: A photomultiplier tube having an electron multiplier comprising a dynode with an attachment lip (10) which is introduced into a slot (20) which is formed in a supporting board (30), the said slot (20) comprising, on the one hand, two outer supporting points (21a, 21b) against which the said attachment lip (10) bears with a first surface (11), and which supporting points have rounded end portions (22a, 22b) and, in addition, at least one central supporting point (23) on which the said attachment lip (10) abuts via a second face (12), which slot (20) comprises holes (24a, 24b, 25) which are located opposite the said outer supporting points (21a, 21b) and the central supporting point (23).