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Biological effects of magnetic fields

The effects of exposure to static and extremely low frequency magnetic fields are of increasing public interest. Concern has been expressed about a possible relationship between the incidence of childhood leukaemia and exposure to the very weak 50 Hz magnetic fields generated by overhead powerlines, and there is an expanding use of devices such as magnetic resonance diagnostic equipment where people are exposed to intense magnetic fields. The biological effects of exposure to those fields have been reviewed recently by a Task Group commissioned by the World Health Organisation and the International Non-ionising Radiation Committee of the International Radiation Protection Association. The Task Group comprised 17 scientists from 12 different countries and met in Kiev, USSR, in 1986. The review probably represents as much of a consensus of international opinion on this topic as is likely to emerge at present. There was no major controversy or disagreement. The most difficult areas of discussion were in defining biological effects which are reproducible and well established, and determining effects on humans which were known to result from magnetic field exposure rather than some other, confounding factor.