Screening unit for radio-isotope production generator

The screening unit for a radio-isotope production generator, comprises a leaden base plate and a vertical leaden mantle placed thereon and provided with a leaden stop which is closable over the place of exit of the isotopes and can be moved in position in the generator, characterised in that the mantle consists of two parts, one part of which is motionless with respect to the baseplate and is provided with an opening of adequate size to pass over the generator, and the other part of which the other part is likewise provided with a through opening to permit the generator to be rotatable about an axis vertical w.r.t. the baseplate so that the opening in the stationary part may be closed. (G.C.)