Iran Occupational Health

Background and aims: Extremely low frequency magnetic field (ELF) is part of Spectrum of electromagnetic waves with range 30 to 300 Hz. The average magnetic field exposures in the workplace have been found to be higher in “electrical occupations” than in other occupations such as office work. The interaction between magnetic fields produced by power lines and substations with living organisms are still open to many researchers. 

Methods: The three axes TES-1394 was used for magnetic field measurement. Magnetic field measuring conducted base of IEEE std 644-1994 standard. Firstly all of magnetic field source was detected, then the measuring stations determined in near and around of source. The jobs that have exposure with magnetic field to maximum exposure were determined and then compare with ISIRI 8567 national standard.

 Results: minimum and maximum measured magnetic field was in near of 63 Kv lines (1.03 μT) and generators (17.6 μT), consequently. The mean of magnetic flux density in near of generators building source have significant difference with other sources. The environmental amount of magnetic flux density in post 230 Kv (1.58 μT) was higher than in other environments. Maximum exposure (17.6 μT) in occupational groups related to engineer’s generators building.

 Conclusion: A result magnetic flux density measurement close to sources matched the other relevant studies except control room. Maximum exposure in any of the occupational groups was not higher than the standard value.