Abstract: A biometric method includes: a step (1) for administering, to a target organism from the outside thereof, one of (i) a target molecule A having both an unpaired electron and a magnetic resonance nucleus having a gyromagnetic ratio smaller than the same of 19F, and (ii) a target molecule B and a radical molecule C, the target molecule B having no unpaired electron, and further having a magnetic resonance nucleus having a gyromagnetic ratio smaller than the same of 19F, the radical molecule C having an unpaired electron; and a step (2) for causing electron spin resonance in the unpaired electron of the target molecule A or the radical molecule C by irradiating electromagnetic waves to the target organism, subsequently triggering nuclear magnetic resonance in the magnetic resonance nucleus having a gyromagnetic ratio smaller than the same of 19F in one of the target molecule A and the target molecule B, and further, measuring nuclear magnetic resonance signals.

Abstract: A biometric method includes: a step (1) for administering, to a target organism from the outside thereof, one of (i) a target molecule A having both an unpaired electron and a magnetic resonance nucleus having a gyromagnetic ratio smaller than the same of 19F, and (ii) a target molecule B and a radical molecule C, the target molecule B having no unpaired electron, and further having a magnetic resonance nucleus having a gyromagnetic ratio smaller than the same of 19F, the radical molecule C having an unpaired electron; and a step (2) for causing electron spin resonance in the unpaired electron of the target molecule A or the radical molecule C by irradiating electromagnetic waves to the target organism, subsequently triggering nuclear magnetic resonance in the magnetic resonance nucleus having a gyromagnetic ratio smaller than the same of 19F in one of the target molecule A and the target molecule B, and further, measuring nuclear magnetic resonance signals.

Abstract: A magnetic field application device capable of applying a magnetic field to an object for a sufficient time is provided. A first magnetic circuit which is one of the two magnetic circuits provided to the magnetic field application device is provided with two magnetic poles of a first magnetic pole 1 and a second magnetic pole 2. The first magnetic pole 1 is provided with a first yoke 11 that is arc-shaped in planar view, a first magnet 13 that is arc-shaped in planar view and a first magnetic pole piece 15. On the other hand, the second magnetic pole 2 is provided with a second yoke 21 that is arc-shaped in planar view, a second magnet 23 that is arc-shaped in planar view and a second magnetic pole piece 25. The first magnetic pole piece 15 and the second magnetic pole piece 25 are disposed so as to be opposed to each other while being separated from each other.