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  1. Probabilistic approach to ranking sources of uncertainty in ELF magnetic field exposure limits.

    Article - En anglais

    There is a need to improve the biological data, dosimetry, and risk assessment methodology used for setting guidelines for occupational exposures to extreme-low-frequency magnetic fields.

    This paper illustrates how a probabilistic approach can be used to determine priorities for future research based upon the analysis of biological and dosimetric variables that affect stimulation of the heart by magnetically-induced currents.

    A model was constructed to predict a level of whole-body magnetic-field exposure below which no cardiac stimulation is expected (Bncs), For each iteration of the model, a value was selected from cardiac stimulation threshold, shape factor, and conductivity distributions by Latin Hypercube sampling, and a value for Bncs was computed.

    The very wide range of simulated Bncs magnetic-field values obtained indicates that there is considerable uncertainty about what constitutes a « safe » level of exposure.

    The results show that the major occupational-exposure guidelines are very conservative with respect to risks of cardiac stimulation.

    The minimum B value computed (0.01 T) by either a circular-loop model or an ellipsoid dosimetric model is ten times the highest recommended workday exposure value in a guideline.

    The lowest 5% B value calculated for a circular-loop model is about 50-times the ICNIRP occupational exposure limit ; the lowest 5% B value calculated for an ellipsoid model is more than 100 times the ACGIH occupational exposure limit. (...)

    Mots-clés Pascal : Champ magnétique, Basse fréquence, Homme, Maladie professionnelle, Marqueur biologique, Dosimétrie, Facteur risque, Guide technique, Irradiation non ionisante, Modélisation, Coeur, Stimulation

    Mots-clés Pascal anglais : Magnetic field, Low frequency, Human, Occupational disease, Biological marker, Dosimetry, Risk factor, Technical handbook, Non ionizing irradiation, Modeling, Heart, Stimulation

    Logo du centre Notice produite par :
    Inist-CNRS - Institut de l'Information Scientifique et Technique

    Cote : 99-0477013

    Code Inist : 002B30B01B. Création : 22/03/2000.