Induced current density in the foetus of pregnant workers in high magnetic field environments
- 34 Downloads
There are moves to limit by legislation the amount of electric and magnetic fields that workers and the general public are exposed to. In work locations near wiring, cables & equipment carrying high electric currents, there are situations in which the proposed magnetic field limits could be exceeded. Since the limits for the general public are more conservative than those for workers and since the foetus or a pregnant worker should be afforded the status of a member of the general public, it is important to assess a worst-case scenario for the purposes of a general code of practice. Three different magnetic field exposures are modelled, which include the worst case — the body of a pregnant woman at a smallest distance of 30 cm to the conductor. All computations were done by using Multiple Multipole Program (MMP), which is based on the Generalized Multipole Technique (GMT) from ETH (Swiss Federal Institute of Technology), Zurich, Switzerland. In a worst-case scenario the proposed basic restrictions would be exceeded slightly in both maternal and foetal tissue. With appropriate pre-placement assessment, these over-exposures can be avoided.
Key wordsmagnetic fields electric fields adverse effects work practices pregnant workers
Unable to display preview. Download preview PDF.
- 1.Wertheimer, N., Leeper, E.,Electrical wiring configurations and childhood cancer, Amer J Epidemiol. 109, 273–284, 1979.Google Scholar
- 3.ICNIRP. Review of the Epidemiologic Literature on EMF & Health, Environmental Health Perspectives 109, Supp. 6, 2001.Google Scholar
- 4.NRPB. Review of the Scientific Evidence for Limiting Exposure to Electromagnetic Fields (0–300 GHz), Available http://www.nrpb.org/publications/documents_of_nrpb/pdfs/do c_15_3.pdf. 15, 2004.Google Scholar
- 5.ESAA. Electricity Supply Association of Australia Guideline: Guidelines for live line barehand work, HB ESAA LLM 01–2000, Electricity Supply Association of Australia Ltd, 2000.Google Scholar
- 6.ICNIRP. Guidelines for limiting exposure to time-varying electric, magnetic, and electromagnetic fields (up to 300 GHz). International Commission on Non-Ionizing Radiation Protection, Health Phys 74, 494–522, 1998.Google Scholar
- 7.IEEE. IEEE Standard for safety levels with respect to human exposure to electromagnetic fields, 0–3 kHz, New York C95.6, 2002.Google Scholar
- 10.10. Hafner, C., Bomholt, L.,The 3D electromagnetic wave Simulator, John Wiley and Sons, Chichester, 1993.Google Scholar
- 11.Hafner, C.,Post-modern Electromagnetics: Using intelligent Maxwell solvers, John Wiley and Sons, Chichester, 1999.Google Scholar
- 12.Ballisti, R., Hafner, Ch. The multiple multipole method in electro- and magnetostatic problems.IEEE Trans. on magnetics, MAG-19, 2367–2370, 1983.Google Scholar
- 18.Martini, F.,Fundamentals of Anatomy and Physiology, Upper Saddle River, NJ. Prentice Hall, 2001.Google Scholar