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Public Protection from Electromagnetic Fields of Industry Frequency

Kazimieras Vytautas Maceika

DOI:


Abstract

Lithuania introduced normative of public protection from 50 Hz frequency electric field. It proposed permissible intensity of this field – 0,5 kV/m inside buildings and 1 kV/m in their territory. Separate normative is prepared for industry frequency electric and magnetic fields in work places. Permitted values of fields depend on exposure duration, but cannot exceed 25 kV/m and 5,1 kA/m. Russian, Swedish and American scientists declare that long time exposure of 50 Hz magnetic field with intensity more than 0,2-0,3 µT is dangerous for carcinogenic risk. International Agency for research on Cancer (IARC) initiated a program to evaluate the carcinogenic risk of low frequency electromagnetic fields to humans and till 2002 year collected a lot of information for different countries with quantitative analysis of epidemic data. Standardized incidents ratio (SIR) was proposed for evaluation of leukaemia in humans and especially children. Exposure of children in magneticfields > 0,4 µT showed a twofold SIR increasing. Data concerning the subject of an evaluation did not disclose inadequate evidence in humans and experimental animals for the carcinogenicity of magnetic fields of industry frequency, but they are classified as “possibly carcinogenic to humans”.

Keywords


Electromagnetic fields; carcinogenicity; standardized incidents ratio.

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