SUPERCONDUCTIVE MAGNETIC SHIELDING BODY

PURPOSE:To make weak magnetic signal measurement possible such as a biological magnetic signal and various high precision magnetic measurement by using a shielding body, which comprises an open-ended tubular superconductor and a plate-like superconductor arranged inside both ends of the tubular superconductor. CONSTITUTION:A plate-like superconductor 2 is arranged at a distance (z) inward from each of the open ends of a tubular superconductor 1. Since the combination of the tubular superconductor 1 and the plate-like superconductors 2 stops external magnetic fields from leaking through the ends of the tubular superconductor 1, a ratio L/D of a length L to an opening diameter D which is necessary for high magnetic shield characteristic can be made small. Therefore, a low magnetic field space can be acquired readily and various high precision magnetic measurement including weak magnetic signal measurement such as a biological magnetic signal becomes possible without being affected by earth magnetism, noises, magnetic field, etc.