Radiometric fill level measuring arrangement

A radiometric measuring arrangement for measuring fill level of a fill substance in a container, comprising:

• a protective tube mounted to the container and extending into the container and being pressure resistant in its mounting;
• an insert mounted to said protective tube and extending into said protective tube, said insert defining a space;
• a radiometric radiator located in said space of said insert for sending radioactive radiation through the container, and located on a first side of the container;
• an absorber situated in said protective tube and associated with said insert said absorber serving to absorb radiometric radiation radiated by said radiometric radiator which is upwardly radiated;
• a radiation protection container having an interior associated with said space of said insert;
• a transport apparatus, which serves for transporting said radiometric radiator at the beginning of a measurement operation from said radiation protection container through said space to a measuring position in said insert, and after termination of a measurement operation for transporting said radiometric radiator back into said radiation protection container;
• and
• at least one detector, arranged on a second side of the container lying opposite to said radiometric radiator, for receiving radiation intensity penetrating through the container as a function of fill level and for converting such into a fill level dependent, electrical signal, wherein:
• the container defines an interior;
• said absorber extends above the installed height of said radiometric radiator over said measuring position and beyond, into said interior of the container;
• and
• on the end of said absorber located in said interior of the container a further absorber segment is provided, which covers a cross section of the opening of said radiation protection container, and serves to absorb radiation emerging from said radiation protection container through the opening, while said radiometric radiator is located in said radiation protection container.