National Physical Laboratory

Specific Absorption Rate (SAR)

NPL's Specific Absorption Rate (SAR) area performs research and measurements relating to the absorption of radio frequency radiation by the human body.

Mobile mast
A mobile phone antenna mast is
a source of electromagnetic fields

We are all continually exposed to man-made electromagnetic fields, and wireless devices such as mobile phones have become a ubiquitous part of our lives. High speed trains, medical imaging systems (MRI) and industrial processes such as plastic welding and induction furnaces can give rise to intense electromagnetic fields. To prevent any adverse health effects, exposure guidelines such as those of the International Commission on Non-ionising Radiation Protection (ICNIRP) give safety limits for public and occupation exposure.

NPL has developed comprehensive calibration and measurement systems to ensure that exposures to electromagnetic fields can be measured accurately and traceable to primary national standards and conducts research and consultancy into electromagnetic exposures from a wide range of sources.

NPL offers calibration of all types of electromagnetic exposure assessment instruments, including specific absorption rate (SAR) probes, traceable to national standards.

Supply of systems

NPL can provide instrumentation for rf and microwave primary standards, secondary calibration systems and reference standards, together with instrument control software covering the kHz to THz frequency range.


Please note that the information will not be divulged to third parties, or used without your permission