Source of electromagnetic radiation
Generally speaking, radar systems, television and broadcast transmission systems, radio frequency induction and medium heating equipment, radio frequency and microwave medical equipment, various electrical processing equipment, communication transmission stations, satellite earth communication stations, large-scale power generation stations, power transmission and transformation Equipment, high-voltage and ultra-high-voltage transmission lines, subway trains, electric trains, and most household appliances are all sources of electromagnetic radiation that can generate various forms, different frequencies, and different intensities.