Figure 5

(A) Transmittance response measured using a fibre optic sensor at 1300 nm as a function of time after sensor immersion in hot spring water subjected (8 kHz 5 mT) or not subjected (No treatment) to electromagnetic field treatment. (B) Absorbance changes as a function of an electromagnetic field frequency and magnetic flux density, respectively, of hot spring water samples subjected to electromagnetic field treatment with respect to the case where water samples were not subjected to any electromagnetic field treatment; such changes were measured with a fibre optic sensor 80 min after electromagnetic field treatment. The relevant experiments were carried out in 2016 on water samples from the hot spring in Matsushiro, Nagano.