Abstract: In a filter cartridge for insertion in a housing for the removal of combustible substances from exhaust gases, with a regeneration of the charged filter material by combustion of the substances, the filter consists of a metallic fiber mat welded together so as to form a hollow cylinder which is disposed tightly on an electrically conductive lattice structure. The ends of the hollow filter cylinder are compressed and tightly held, by metal sleeves, in engagement with a cartridge head and a cartridge foot structure and they are welded together by an end face weld seam. Current is supplied to the filter cylinder by way of the cartridge head and foot structure for heating the filter cylinder directly so that the combustible substances collected on the inside of the filter cylinder are efficiently burnt.

Abstract: An apparatus for detecting iodine isotopes in the exhaust gas of a nuclear installation includes a duct for a partial exhaust gas stream, which duct includes an absorption chamber which is disposed in a radiation shielding structure and through which the exhaust gas flows and which has associated therewith means for admitting absorption material and for removing it therefrom. Radiation detectors are supported in the radiation shielding structure at opposite sides of the absorption chamber for monitoring radiation of iodine isotopes collected therein, the cavity in the shielding structure in which the absorption chamber is disposed being larger than the absorption chamber and the absorption chamber being supported so as to be movable in the cavity relative to said detectors to permit calibrating the apparatus.