威海市广播电台电磁辐射环境影响的研究

Study on the Environmental Impact Caused by the Electromagnetic Radiation of Weihai Broadcasting Station.

通过理论分析计算和实地的模拟测试,探讨场源辐射场强E随距离Υ的一次反比衰减规律。对10kW中波发射天线,在Υ>75m的区域内,地面附近(距地面2m处),场强E<25V/m,不会超过国标GB9175-88中对长中短波规定的卫生要求的“二级标准”;在Υ>150m的区域内,地面附近场强E<10V/m,符合国标卫生要求的“一级标准”;但在Υ>200m范围内的高层建筑的外部(例如楼顶平台)则有可能超过国标规定;对非接地的金属导体由于感应充电和二次辐射,可能造成对人体的电热损伤。

The attenuation of the electrical field strength E of an electromagnetic source was investigated theoretically and experimentally. For the 10kW medium wave transmitter, the electrical field E is less than 25V/m for distances r > 75m near the ground (2m above the ground) , which is lower than the 'Second Class Standard' stipulated in the State Standard GB9175-88. For distances r>150m, the field strength near the ground is less than 10V/m, which is lower than the ' First Class Standard'. However, it is discovered from the measurements that at places such as the platforms on top of high buildings within 200m the field strength can be so strong that it exceeds the State Standard value, and that injures to human bodies can be caused by metal structures poorly earthed due to induction charge and secondary radiation.