| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic field measuring method through the use of sheets with high magnetic permeability. SOLUTION: A magnetic field shielding device 40 is the one where a plurality of sheets having high magnetic permeability are arranged by partial superimposition on pluralities of non-magnetic cylindrical members which is arranged by concentrically enclosing a first direction axis to have a hollow part, where the most inner cylindrical member is provided with first and second openings 41 and 42 at both ends in a first direction and with a third opening being put through the cylindrical members in a vertical direction with respect to the first direction axis and also by which a component in the vertical direction concerning the first direction in an extraneous magnetic field is shielded in the internal space of the most inner cylindrical member. A living body is loaded on loading devices in the internal space of the device 40 or the loading devices where the living body is loaded are carried into the internal space. The bottom surface of a cryostat 50 for keeping low temperature in pluralities of SQUID flux meters is arranged to face the front surface of the living body and, then, the component in the vertical direction concerning the first direction in the magnetic field generated from the living body is detected by the SQUID flux meters. Thus, the magnetic field is measured with high performance. |
