Appts. for extracting separate samples of highly active fluids contg. solid matter, has a switching system by which a sampling container is manipulated. The container can be displaced from a posn. into which it is delivered by a magazine feeder, for bringing into contact with the hollow needle of an injection head, by which it is filled, to a position in which it is accessible for transfer as required. It includes an operating shaft, in the bore of which a nut is fixed and a screwed spindle which is movable relatively to the nut. There is also a revolving head with a recess for the bottle or tube for the sample, and a carrier fixed to the surface of the envelope of the revolving head which works in the groove of a slide sleeve. A magnetic clutch between the nut and the spindle of the revolving head, can be unlocked by means of the carrier and the slide. Arrangement ensures that the samples obtd. reliably represent the fluid being processes, and that radioactivity is prevented from leaking to the outside. The use of the conical needle head with the venturi nozzle eliminates obstruction and prevents drip when the bottles or test tubes are removed. Axial motions which assist contamination are avoided.
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