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50‐Hz magnetic field exposure system for small animals
Author(s) -
Shigemitsu Tsukasa,
Takeshita Kazuma,
Shiga Yoichi,
Kato Masamichi
Publication year - 1993
Publication title -
bioelectromagnetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.435
H-Index - 81
eISSN - 1521-186X
pISSN - 0197-8462
DOI - 10.1002/bem.2250140204
Subject(s) - bioelectromagnetics , field (mathematics) , magnetic field , physics , nuclear magnetic resonance , mathematics , pure mathematics , quantum mechanics
Abstract The design, construction, and results of evaluation of an animal‐exposure system for the study of biological effects of extremely low frequency (ELF) magnetic fields are described. The system uses a square coil arrangement based on a modification of the Helmholtz coil. Due to the cubic configuration of this exposure system, horizontal and vertical magnetic fields as high as 0.3 mT can be generated. Circularly polarized magnetic fields can also be generated by changing the current and phase difference between two sets of coils. Tests were made for uniformity of the magnetic field, stray fields, sham‐exposure ratio of stray field, changes of temperature and humidity, light intensity and distribution inside the animal‐housing space, and noise due to air‐conditioning equipment. Variation of the magnetic field was less than 2% inside the animal housing. The stray‐field level inside the sham‐exposure system is less than 2% of experimental exposure levels. The system can be used for simultaneous exposure of 48 rats (2 to a cage) or 96 mice (4 to a cage). © 1993 Wiley‐Liss. Inc.