Gas floating type door

A door is constituted with a material having a shielding radiation performance. A gas jetting device which can jet a pressurized gas (for example, pressurized air) to a floor is disposed at the lower portion of the door. The gas jetting device has a structure containing a diaphragm to the inside of a disk which opens downwardly, and the disk is attached to the door. Pressurized air is supplied to the inside of the diaphragm to expand the latter. A pressure zone is formed, and air leaks to the atmospheric air to form a thin air membrane between the diaphragm and the floor. With such a constitution, the door is raised up, and the door and the floor are completely isolated to provide a quite friction-free state. A horizontal force is applied to the floating door manually or by an electric or hydraulic motor to displace the door horizontally. With such procedures, a small-sized radiation shielding door which can be opened and closed by an economical driving device can be attained. (I.N.)