An installation for treating articles by radiation, the installation comprising a structure (1) having an article transport device (10) mounted thereon with a portion housed in a shielded enclosure (2) in the vicinity of at least one radiation emitter (3), the enclosure including a tunnel (40) having internal transverse partitions (51, 52, 53, 54) defining a baffle passage (50) through which there extends a segment of the transport device. The partitions are arranged in such a manner that the baffle passage extends in a plane that is substantially vertical.A packaging installation including such a processing installation.
