Non-ionising radiation (NIR) is the term used to describe the part of the electromagnetic spectrum covering two main regions, namely optical radiation (ultraviolet (UV), visible and infrared) and electromagnetic fields (EMFs) (power frequencies, microwaves and radio frequencies).

The Physical Agents (Optical Radiation) Directive information is available at:

For more information about Magnetic Resonance Imaging (MRI) please see our MRI practice pages.