北京市某高层建筑高空电磁辐射环境影响分析

摘要

A typical high-rise building in Beijing was chosen as a monitoring area for learning about the e-lectromagnetic radiation level in high-altitude environment.Wide-band and narrow-band monitoring instruments were used so as to estimate the general electromagnetic radiation environment level in monitoring area,and make clear of the sources from which the main electromagnetic energy was released as well.The results show that the general electric field intensity in this high-altitude area is below the reference level for general public limited by national standard,though it is above the ground level.The monitoring area is mainly impacted by Medium-wave Station,which is about 30 km away,and secondarily the Central TV Tower,which is about 9 km away.Medium-wave signals from the frequency of 639 kHz have the biggest influence,taking up over 95% of the total energy in the frequency band of 100 kHz ~300 MHz,and secondarily the medium-wave signals from the frequency of 1 .28 MHz.Some suggestions were also given based on the environmental protection perspective,such as,when sensitive buildings are constructed,the influence scope of medium wave should be taken into consideration be-cause of its transmitting characteristics.%选取北京市某代表性高层居民楼顶平台作为高空电磁辐射环境水平监测点进行综合场强和选频监测，评价总体电磁辐射环境水平，并分析监测区域电磁辐射能量的来源。结果表明：该高空监测区域的电磁辐射环境总体水平低于国家规定的公众照射导出限值，但高于地面水平。监测区域主要受30 km 外的中波台影响，其次是9 km 外的中央电视塔。影响最大的是639 kHz频率的中波信号，占100 kHz～300 MHz总场强的95％以上，其次是1．28 MHz频率的中波信号。提出，开展敏感建筑物规划建设时，应考虑中波的传播特性和对环境的影响。