We report the attraction of radon daughter nuclei in normal domestic room air to everyday sources of power frequency electromagnetic fields.
TASTRAK plastic track detectors were used to measure è-emission from the radon (#F2#F2#F2Rn) daughters #F2#F1#F8Po and #F2#F1#F4Po close to 50-Hz mains frequency power cables and domestic appliance leads.
We observed that wires carrying mains frequency potential attract radon daughter nuclei in a manner visually similar to the attraction of iron filings to a magnet.
Increased deposition of up to a factor of 18 was observed.
Further experiments designed to simulate the effect of overhead power lines at ground level showed large scale variations in local plateout and airborne concentration of radon daughters.
The effects appear to be due to interactions of the electric component of the EM-field with both the ultrafine and attached fraction of radon daughter aerosols.
Three mechanisms have been examined.
First, aerosols instantaneously polarize in sympathy with the electric component of an applied mains frequency EM-field and as a result may migrate up strong E-field gradients.
This effect is however quite weak and may only affect larger aerosols in strong field gradients.
Second, charged aerosols oscillate in a 50-Hz field and in the case of the ultrafine fraction this may lead to significantly increased plateout.
Third, there is the possibility that oscillation of charged aerosols induces fluctuations in the magnitude ...
Mots-clés Pascal : Champ électromagnétique, Enfant, Effet biologique, Irradiation alpha, Radon, Air, Pollution intérieur, Homme
Mots-clés Pascal anglais : Electromagnetic field, Child, Biological effect, Alpha irradiation, Radon, Air, Indoor pollution, Human
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0168148
Code Inist : 002B30A02B. Création : 199608.