Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
Health Phys. 2013 Jan;104(1):87-94. doi: 10.1097/HP.0b013e31826f51c1.
Extremely Low-Frequency (ELF) electric and magnetic fields belonging to the nonionizing electromagnetic radiation spectrum have a frequency of 50 - 60 Hz. All people are exposed to a complex set of electric and magnetic fields that spread throughout the environment. The current study was carried out to assess people's exposure to an ELF electric field in the Tehran metropolitan area in 2010. The measurement of the electronic fields was performed using an HI-3604 power frequency field strength measurement device. A total number of 2,753 measurements were performed. Afterward, the data obtained were transferred to the base map using Arc View Version 3.2 and Arc Map Version 9.3. Finally, an interpolation method was applied to expand the intensity of the electric field to the entire city. Based on the results obtained, the electric field was divided into three parts with various intensities including 0-5 V m, 5-15 V m, and >15 V m. It should be noted that the status of high voltage transmission lines, electric substations, and specific points including schools and hospitals were also marked on the map. Minimum and maximum electric field intensities were measured tantamount to 0.31 V m and 19.80 V m, respectively. In all measurements, the electric field was much less than the amount provided in the ICNIRP Guide. The results revealed that 141 hospitals and 6,905 schools are situated in an area with electric field intensity equal to 0-5 V m, while 15 hospitals and 95 schools are located in zones of 5-15 V m and more than 15 V m. Examining high voltage transmission lines and electric substations in Tehran and its suburbs suggested that the impact of the lines on the background electric field of the city was low. Accordingly, 0.97 km of Tehran located on the city border adjacent to the high voltage transmission lines have an electric field in the range of 5 to 15 V m. The noted range is much lower than the available standards. In summary, it can be concluded that the public is not exposed to a risky background electric field in metropolitan Tehran. The result of comparing sensitive recipients showed that the schools have a more desirable status than the hospitals. Nonetheless, epidemiologic studies can lead to more understanding of the impact on public health.
极低频（ELF）电场和磁场属于非电离电磁辐射谱，频率为 50-60Hz。所有人都暴露在复杂的电场和磁场中，这些电场和磁场遍布环境中。本研究旨在评估 2010 年德黑兰大都市区内人们对 ELF 电场的接触情况。使用 HI-3604 工频场强测量装置测量电子场。共进行了 2753 次测量。之后，将获得的数据通过 Arc View Version 3.2 和 Arc Map Version 9.3 传输到基础地图上。最后，应用插值法将电场强度扩展到整个城市。根据所得结果，将电场分为三个不同强度的区域，包括 0-5V/m、5-15V/m 和>15V/m。值得注意的是，地图上还标记了高压传输线路、变电站和包括学校和医院在内的特定地点的状态。最小和最大电场强度分别测量为 0.31V/m 和 19.80V/m。在所有测量中，电场强度均远低于 ICNIRP 指南中规定的量。结果表明，141 家医院和 6905 所学校位于电场强度为 0-5V/m 的区域，而 15 家医院和 95 所学校位于 5-15V/m 和>15V/m 的区域。检查德黑兰及其郊区的高压传输线路和变电站表明，线路对城市背景电场的影响较小。因此，位于与高压传输线路相邻的城市边界上的 0.97 公里的德黑兰地区，电场强度在 5-15V/m 之间。所记录的范围远低于可用标准。总的来说，可以得出结论，德黑兰大都市区的公众不会接触到危险的背景电场。对敏感受体的比较结果表明，学校的状况优于医院。然而，流行病学研究可以更深入地了解对公众健康的影响。
