Abstract: The container consists of a shielded body having an internal cavity and of a capsule which can be inserted into the cavity and is capable of sliding motion along the axis of this latter. The front face of the capsule is sealed by means of a removable door and the rear face is attached to an operating rod. The cavity is sealed beyond the front face of the capsule by means of a shielded element for positioning a cover opposite to the removable door of the capsule. The cover cooperates with means for permitting leak-tight coupling or uncoupling of the cover and the capsule by displacing these latter in relative motion.