Whether the electro-magnetic (EM) fields are carcinogenic or not still rema
ins to be discussed From scientific point of view. Recently a possibility w
as pointed out that increased deposition of radon progeny in the EM-Fields
should enhance exposure dose to internal body. We investigated the behavior
of charged Rn-222 progeny and aerosols containing them by measuring the pa
ttern and the magnitude of the deposition rate of decay products on both CR
-39 track detectors and imaging plates under various conditions. We conclud
ed that the attachment td wire cables should be increased mainly by electri
c component of low frequency EM-fields and possibly by electric field induc
ed by strong changing magnetic ones.