Major U.S. and international guidelines for limiting occupational exposures to EMF are evaluated.
These safety guidelines are designed to prevent short-term adverse effects by maintaining bulk-tissue current densities below 10 mA m-2 (rms).
Above this level, effects of induced currents and electric fields can include stimulation of neural and cardiac tissues.
The models and input data used by guideline-setting organizations to relate 50/60-Hz magnetic-field exposures to induced current densities differ significantly.
In order to develop a better understanding of such differences, the current densities derived from exposure guideline models are compared to minimum thresholds for cardiac stimulation and fibrillation.
The nominal minimum thresholds for cardiac stimulation and ventricular fibrillation are 100 times and 200 times greater, respectively, than the current density of 10 mA m-2 used as a dosimetric limit.
However, the assumed relationship between the 10 mA m-2 dose limit and magnetic field exposure limits introduces additional uncertainty.
The ratios between the threshold for cardiac stimulation and the calculated induced current density at the exposure limit vary between a low of 50 and a high of 526, depending upon the guideline. (...)
Mots-clés Pascal : Exposition professionnelle, Homme, Champ électrique, Champ magnétique, Conduite à tenir, Courant induit, Stimulation galvanique, Norme, Irradiation non ionisante, Prévention, Dosimétrie, Documentation, Maladie professionnelle
Mots-clés Pascal anglais : Occupational exposure, Human, Electric field, Magnetic field, Clinical management, Induced current, Galvanic vestibular test, Standards, Non ionizing irradiation, Prevention, Dosimetry, Documentation, Occupational disease
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0471780
Code Inist : 002B30B01B. Création : 03/02/1998.