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Ionising Radiation Medical Exposure Regulations (IRMER)

  • Organisations we regulate,
  • Diagnostic and/or screening services,
  • Hospitals,
  • Hospital dental services,
  • Prison health services

We enforce Ionising Radiation (Medical Exposure) Regulations (IR(ME)R) in England.

Medical ionising radiation includes x-rays and nuclear scans, and treatments such as radiotherapy. It is widely used in hospitals, dentists, clinics and in medical research to help diagnose and treat conditions.

Ionising Radiation (Medical Exposure) Regulations (IR(ME)R) sets out the responsibilities of duty holders (the employer, referrer, IR(ME)R practitioner and operator) for radiation protection.

For example:

  • minimising unintended, excessive or incorrect medical exposures
  • ensuring the benefits outweigh the risks of each exposure (justification)
  • keeping doses in diagnostics “as low as reasonably practicable” for their intended use (optimisation)


The Ionising Radiation (Medical Exposure) Regulations 2017 replace the 2000 regulations (including amendments made in 2006 and 2011).

The full regulations can be found on

Guidance and supporting information

Professional guidance on the requirements of IR(ME)R:

Last updated:
04 October 2018


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