A system for simultaneous exposure of small animals to 50‐Hz electric and magnetic fields

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Abstract
Equipment designed for simultaneous exposure of rodents to 60‐Hz electric and magnetic fields is described. Three identical systems were constructed, each capable of continuous exposure of 256 rats or 640 mice to a nominal electric field at <50 kV/m, and to horizontal and vertical magnetic fields at < 1 mT. Design features, construction details, and results of various tests of the systems are described. Tests were made: of phase relations between electric and magnetic fields; of uniformity of electric and magnetic fields; of changes across time in electric‐field intensity as a result of animals' soiling of cages and various washing routines; of resistance of bedding material during humid and dry conditions; and of acoustic noise due to background, to field‐generation equipment, and to air conditioning equipment. The results demonstrated that fields were effectively generated but that significant and troublesome changes in electric‐field intensity occurred because of cage‐soiling. However, when cages were frequently cleaned, field intensities were consistent from one exposure to another.

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