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. 2011 Oct;92(5):469–477. doi: 10.1002/bdrb.20316

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© 2011 Wiley Periodicals, Inc.

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Fig. 1 — Intermediate frequency (20 or 60 kHz) magnetic field exposure system for small laboratory animals. Two exposure systems were built; one for 20 kHz and another for 60 kHz. Their appearances and dimensions were identical so that the systems were interchangeable for the sham-exposure (control) system. Coil wires for 20 or 60 kHz MF were installed in four horizontal wooden bobbins of the respective exposure system. Distances between the four coils were 60, 41, and 60 cm. The sides of the square coils were 150 cm, and the height of the top coil bobbin from the floor was 222 cm. The Merritt-type four-square coils could produce uniform (± 3%) 20 kHz MF up to 0.200 mT(rms) or 60 kHz MF up to 0.100 mT(rms) magnetic fields in a cubic space (100 × 100 × 100 cm) at the center of the coils where three wooden racks were layered to accommodate up to 36 rat cages in total. The magnetic field was vertical in orientation and sinusoidal in waveform.