![]() In the United States, cell phones currently operate in a frequency range of about 1.8 to 2.2 GHz ( 2). #The few institute portable#Radiofrequency radiation. The most common sources of radiofrequency radiation are wireless telecommunication devices and equipment, including cell phones, smart meters, and portable wireless devices, such as tablets and laptop computers ( 1). These EMFs can come from a number of sources.Įxtremely low frequency EMFs (ELF-EMFs). Sources of ELF-EMFs include power lines, electrical wiring, and electrical appliances such as shavers, hair dryers, and electric blankets. ![]() Human-made EMFs fall into both the ELF and radiofrequency categories of non-ionizing part of the electromagnetic spectrum. The earth’s magnetic field, which causes the needle on a compass to point North, is one example of a naturally occurring EMF. There are both natural and human-made sources of non-ionizing EMFs. Radiofrequency radiation is measured in watts per meter squared (W/m 2). ELF-EMFs have frequencies of up to 300 cycles per second, or hertz (Hz), and radiofrequency EMFs range from 3 kilohertz (3 kHz, or 3,000 Hz) to 300 gigahertz (300 GHz, or 300 billion Hz). Low- to mid-frequency EMFs include extremely low frequency EMFs (ELF-EMFs) and radiofrequency EMFs. These EMFs are in the non-ionizing radiation part of the electromagnetic spectrum and are not known to damage DNA or cells directly.
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