A cabinet structure for a system that generates and infuses radiopharmaceuticals, the cabinet structure comprising a platform on which the system is mounted and a shell surrounding an interior space of the structure, the cabinet structure being characterised in that: the interior space is sized to contain an entire shielding assembly of the system, the shielding assembly providing a barrier to radioactive radiation; the shell comprises a first upper opening through a top surface of the shell into the interior space, a second upper opening through an upper surface of the shell into the interior space, a liftable panel and an access panel; the liftable panel provides access to the first upper opening; the access panel mates with the second upper opening and is removable therefrom; the first upper opening is sized to provide access to a lid of a first compartment of the shielding assembly, when the shielding assembly is positioned within the interior space, the first compartment being formed from a sidewall of the shielding assembly and being configured to receive a waste bottle of the system, wherein the lid may be lifted from the first compartment of the shielding assembly; and the second upper opening is sized to provide access to a door of a sidewall enclosing a second compartment of the shielding assembly, when the shielding assembly is positioned within the interior space, the second compartment being configured to receive a radioisotope generator, wherein the first upper opening and the lid are located at a first elevation with respect to a lowermost portion of the cabinet structure and the second upper opening and door are located at a second elevation, with respect to the lowermost portion of the cabinet structure, the second upper opening being oriented to allow a lowering of one or more radioisotope generators, for the system, into the interior space, and a lifting of the one or more generators out from the interior space when the access panel is separated from the shell, and the second elevation being lower than the first elevation. the interior space is sized to contain an entire shielding assembly of the system, the shielding assembly providing a barrier to radioactive radiation; the shell comprises a first upper opening through a top surface of the shell into the interior space, a second upper opening through an upper surface of the shell into the interior space, a liftable panel and an access panel; the liftable panel provides access to the first upper opening; the access panel mates with the second upper opening and is removable therefrom; the first upper opening is sized to provide access to a lid of a first compartment of the shielding assembly, when the shielding assembly is positioned within the interior space, the first compartment being formed from a sidewall of the shielding assembly and being configured to receive a waste bottle of the system, wherein the lid may be lifted from the first compartment of the shielding assembly; and the second upper opening is sized to provide access to a door of a sidewall enclosing a second compartment of the shielding assembly, when the shielding assembly is positioned within the interior space, the second compartment being configured to receive a radioisotope generator, wherein the first upper opening and the lid are located at a first elevation with respect to a lowermost portion of the cabinet structure and the second upper opening and door are located at a second elevation, with respect to the lowermost portion of the cabinet structure, the second upper opening being oriented to allow a lowering of one or more radioisotope generators, for the system, into the interior space, and a lifting of the one or more generators out from the interior space when the access panel is separated from the shell, and the second elevation being lower than the first elevation.