Gong-kuang zidonghua (Nov 2022)
Influence of underground radio wave on human body in coal mine
Abstract
The large-power radio waves emitted by 5G, WiFi6, UWB, ZigBee and other mine mobile communication systems and personnel and vehicle positioning systems will affect the health of underground personnel. Therefore, it is necessary to study the influence of underground radio waves on human body. The influence of electromagnetic radiation on the human body has been studied. Different parts of the human body have different absorption capacities to electromagnetic radiation, and electromagnetic radiation has the greatest impact on the human head. Radio wave emission power limits include occupational exposure limits and public exposure limits. Occupational exposure means that the exposure time of the personnel in the electromagnetic radiation environment is no more than 8 hours. The working time of coal mine underground personnel is 8 hours per shift for 3 shifts or 6 hours per shift for 4 shifts. Therefore, the minimum limit value of 6.28 W of radio wave transmission power for whole-body occupational exposure shall be selected as the limit value of radio wave transmission power in the coal mine. In order to prevent the gas explosion caused by coal mine underground radio wave emission, GB/T 3836.1-2021 Explosive Atmospheres - Part 1: Equipment-General Requirements stipulates that the radio wave transmission power in coal mines shall not be greater than 6 W. Therefore, the 5G, WiFi6, UWB, ZigBee and other mine mobile communication systems and personnel and vehicle positioning systems that have obtained the explosion-proof certificate and the permit for the use of mining safety signs will not cause harm to the underground personnel of the coal mine under the condition that the distance between the wireless transmission antenna and the fixed post personnel is greater than 1 m.
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