Objectives The purpose of this study was to estimate exposure to extremely low frequency (ELF) magnetic and electric fields in the Quebec electrical utility Hydro-Quebec.
Methods Personal exposures to ELF magnetic and electric fields were measured for workers randomly selected from 32 job categories at Hydro-Québec.
Weekly arithmetic and geometric means, and other indices of exposure were estimated from 465 worker-weeks of data.
Results By job category, the arithmetic means of the ELF magnetic field exposures ranged from 0.09 to 2.36 muT.
Those of the ELF electric field exposures ranged from 2.5 to 400 V. m-1.
Within each field, correlations of either the arithmetic or geometric means with alternative indices, including an index of the time rate of change, were generally high (r = 0.8).
Exceptions were the 20th percentile of the electric means and the proportion of time above 12.4 and 100 muT.
The day-to-day variation of exposure was greater than the variation between workers.
The median between-day and between-worker components of variance (as geometric standard deviations) by job category were 2.13 and 1.71 for magnetic fields (2.24 and 1.81 for electric fields).
Conclusions Substation workers, hydroelectric generating station operators, and cable splicers showed the highest arithmetic means for 60-Hz magnetic fields above 1 muT. (...)
Mots-clés Pascal : Champ électromagnétique, Extrême basse fréquence, Compagnie électricité, Toxicité, Exposition professionnelle, Activité professionnelle, Poste travail, Québec, Canada, Amérique du Nord, Amérique, Médecine travail, Epidémiologie, Analyse statistique, Homme, Matrice emploi exposition
Mots-clés Pascal anglais : Electromagnetic field, Extremely low frequency, Electric utility, Toxicity, Occupational exposure, Professional activity, Workplace layout, Quebec, Canada, North America, America, Occupational medicine, Epidemiology, Statistical analysis, Human
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0073714
Code Inist : 002A08E. Création : 21/05/1997.