Processing device comprising - one or several treatment stations (2, 102, 202) for the sterilisation of containers via electron beams, each treatment station comprising sterilisation means (3, 103, 203) which comprise an electron-beam emitter (31, 131, 231) provided with a tubular nozzle (32, 132, 232) and supporting means (5, 105, 205) for supporting a container under said emitter, said emitter able to emit an electron beam passing through the upper opening of a container supported by said supporting means in order to sterilise said container, and - a protection system in order to stop the radiation emitted by the emitter or emitters, and comprising for each treatment station, - an upper portion (6A, 106A, 206A) assembled to the emitter and having the shape of a bell formed from a first plate (4, 104, 204) referred to as upper and from a tubular wall (61, 161, 261) extending downwards from said upper plate (4, 104, 204), said emitter being mounted on said first plate and its nozzle extends substantially vertically under the upper plate, - a lower portion (6B, 106B, 206B) comprising a second plate (5, 105, 205), referred to as lower, constituting said supporting means, characterized in that it further comprises moving means (9, 109, 209) able to carry out a relative movement of the upper portion in relation to the lower portion between a retracted position wherein the upper portion is separated from the lower portion, in order to allow for the positioning under the emitter of a container supported by the supporting means, and operative positions wherein the upper portion and the lower portion form a protective or shielding enclosure (E1, E2, E3) wherein are positioned the emitter and the container supported by the supporting means, the lower plate being arranged in the bell when the upper portion is in an active position, said moving means being able to move the upper portion between a first operative position wherein the distal end (32a, 232a) of the nozzle (32, 132, 232) is arranged above the upper opening of the container and an extreme operative position wherein said nozzle extends in the container, the lower plate (5, 105, 205) having a tubular wall (62, 162, 262) extending downwards from said lower plate (5, 105, 205), able to slide in the tubular wall (61, 161, 162) of said upper portion (6A, 106A, 206A) and enabling their overlapping. - one or several treatment stations (2, 102, 202) for the sterilisation of containers via electron beams, each treatment station comprising sterilisation means (3, 103, 203) which comprise an electron-beam emitter (31, 131, 231) provided with a tubular nozzle (32, 132, 232) and supporting means (5, 105, 205) for supporting a container under said emitter, said emitter able to emit an electron beam passing through the upper opening of a container supported by said supporting means in order to sterilise said container, and - a protection system in order to stop the radiation emitted by the emitter or emitters, and comprising for each treatment station, - an upper portion (6A, 106A, 206A) assembled to the emitter and having the shape of a bell formed from a first plate (4, 104, 204) referred to as upper and from a tubular wall (61, 161, 261) extending downwards from said upper plate (4, 104, 204), said emitter being mounted on said first plate and its nozzle extends substantially vertically under the upper plate, - a lower portion (6B, 106B, 206B) comprising a second plate (5, 105, 205), referred to as lower, constituting said supporting means,