Stop device for radiation beams, comprising: a stop (8) for blocking radiation beams and a drive device associated with the stop (8) to change the position of the stop (8). The drive device comprises a first circular element (1) that defines a circumference (C), a second element (4) movable along said circumference (C) and which can turn in turn around a perpendicular axis (X ') with respect to the plane defined by the circumference (C) and a support (7) that joins the second element (4) to the stop (8), so that the displacement of the second element (4) along said circumference (C) and / or the rotation of said second element (4) allow the stop (8) to be arranged in different positions.
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