Electromagnetic field shielding (EMF) is a way to reduce daily exposure to electromagnetic radiation. Shielding is accomplished by placing a bulk material, such as grounded steel or other metal plates, between the source of the radiation and the person.
The type of EMF a person is being exposed to determines the type of material that is most effective for shielding. EMF is encountered in different ways every day, mostly in extremely low frequencies, which are practically unnoticeable except by those who are extremely sensitive to it. EMF exposure comes from microwaves, high voltage power lines, cell phones, fluorescent lights, transformers, electrical panels, anti-theft systems and other commonplace items.