Inconsistent findings from recent mortality studies of workers exposed to magnetic fields have led to calls for more detailed understanding of exposure distributions and metrics in various industries.
The authors undertook personal monitoring at an automobile transmission plant to (a) learn if magnetic field exposure differences were present, (b) make assignments for a brain cancer study, and (c) compare two exposure indices.
A wide range of average exposures occurred (i.e., 0.016-4.6 microtesla).
Within-day variability was also large, and it reached 4 orders of magnitude for some workers.
Unexpectedly, demagnetizers were found among the strong sources that contributed to elevated exposures.
The authors used conventional summary measures to assign job groups to exposure categories, and they used a new index of exposure irregularity to make alternative assignments.
These new assignments appeared to differ from the original ones with respect to work time in each exposure group (i.e., 54% of the work time fell into different exposure categories).
Mots-clés Pascal : Industrie automobile, Exposition professionnelle, Médecine travail, Homme, Champ magnétique, Etude cas témoin, Tumeur maligne, Encéphale, Toxicité, Long terme, Méthode étude, Biais méthodologique
Mots-clés Pascal anglais : Automobile industry, Occupational exposure, Occupational medicine, Human, Magnetic field, Case control study, Malignant tumor, Brain (vertebrata), Toxicity, Long term, Investigation method, Methodological bias
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0368658
Code Inist : 002A08E. Création : 12/09/1997.