Ionising radiation regulations: requirements

Requirements of the Ionising Radiation (Medical Exposure) Regulations 2000 (IRMER) for exposures much greater than intended and diagnostic reference levels.



These documents are aimed at radiology and medical physics staff. They provide information on the following:

  • medical exposures ‒ regulatory and enforcement background
  • reporting exposures much greater than intended

See details of the national diagnostic reference levels (NDRLs) which shows the NDRLs for common x-ray examinations for patients.

Published 5 September 2012
Last updated 13 January 2017 + show all updates
  1. Added guidance on investigation and notification of medical exposures much greater than intended.
  2. First published.