EMF Glossary

Beam angle

Beam Angle Definition

Beam angle is the light spread over distance. A narrow beam angle concentrates light, while a wide beam angle spreads the light. At the same distance from the light source, the narrow beam has more energy.
Learn More
Girl with EHS

Electro Hypersensitivity (EHS) Definition

Electro hypersensitivity is an adverse biological reaction to EMF exposure.
Learn More
Extremely low frequency of 3 Hz

ELF (Extremely Low Frequency) Definition

Extremely Low Frequencies are those radio waves with frequencies between 3 and 30 Hz. ELF are a form of electromagnetic radiation.
Learn More
Magnetic poles

Gauss (G or Gs) Definition

Gauss is a measure of a magnetic field's force on another magnetic field or on a conductor such as metal.
Learn More
Four Hertz graph

Hertz (Hz) Definition

Hertz is the number of cycles (waves) that pass a given area in one second.
Learn More

Irradiance Definition

Irradiance is the the light therapy device's power output in milliwatts per square centimeter of surface area at a given distance, where distance is usually three, 6, or 9 inches from the body.
Learn More
Neuro muscular electrical stimulator on the legs

Neuromuscular Electric Stimulation (NMES) Definition

Neuromuscular Electric Stimulation (NMES) is a therapeutic devices that uses electricity to cause muscles to contract.
Learn More

Power Density

See irradiance for power density definition and calculations
Learn More
Surgical Incision PEMF Coil

Pulsed Electromagnetic Frequencies (PEMF) Definition

A PEMF device delivers magnetic fields through tissue to the target area. PEMF is not an electromagnetic therapy: it is a magnetic therapy.
Learn More
RF satellite communication

Radio Frequency (RF) Definition

The Radio Frequency (RF) bandof the electromagnetic spectrum contains frequencies from 3 kHz to 300 GHz. The Microwave (MW) band is a portion of the RF band.
Learn More
5G uses SHF waves

Super High Frequency (SHF) Definition

Super High Frequency includes radio waves from 3 GHz to 30 GHz on the EM spectrum.
Learn More
SAR should tell you how much RF your brain absorbs

SAR (Specific Absorption Rate) Definition

SAR is a measure of how much non-ionizing radiation your body would absorb under laboratory conditions. It's actually a meaningless number that tells you nothing about the safety of a phone's RF emission.
Learn More