The invention relates to a device for dispensing in particular cylindrical radiation sources 9 from a container and for introducing the radiation sources 9 into a predefined target volume 11 with a hollow needle 1. According to the invention, a clamp device 19 is provided for the mandrel 8, with which the latter is held in a position fixed in relation to the target volume 11 and the hollow needle 1 is guided displaceably in the direction of the mandrel 8 when the latter is clamped in position. IMAGE
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