| 摘要 |
PROBLEM TO BE SOLVED: To measure magnetocardiography of all the age groups from an adult to an infant by making the shape of a part on the face side into a linear shape so as to make the part in parallel to the shoulder when the bottom face of a Dewar is brought to be close to the pectoral region of a human body and arranging a magnetic sensor consisting of a quantum interference element on the inner bottom face of the Dewar. SOLUTION: Dewar has a double structure of an inner container 7 holding a liq. helium and an outer container 8 on the outside and is insulated with a vacuum layer between them. The outer container 8 has a structure wherein an cylinder with a larger diameter on its top part and a cylinder with a samller diameter on its bottom part are connected with each other and the cylinder on the bottom part has a shape provided with a linear cutout in such a way that the Dewar does not cover the face and becomes in parallel to the shoulder. In addition, the bottom part of the inner container 7 is made into a similar figures to the outer container 8 and a circular cylinder a part of which is broken off. In addition, in the intermediate part, the diameter is made larger to increase the amt. of holding of liq. helium. In addition, on the bottom face in the inside of the Dewar, a magnetic sensor 4 consisting of a quantum interference element is arranged. |
