Radiation Protection Glossary

A radiation protection glossary for Radiation Protection Supervisors (RPS) and anyone interesting in radiation safety terminology. The glossary is a mixture of health physics terms, and phrases related to radiation legislation, transport, practical safety and similar.

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Specified practice

A specified practice is a term defined in Regulation 7 of the Ionising Radiations Regulations 2017 (IRR17). A specified practice is work with ionising radiation in the UK, which is placed into the highest risk category, and therefore requires a 'consent' from the Health and Safety Executive (HSE). A list of specified practices will include the following:


(a) the deliberate administration of radioactive substances to persons and, in so far as the radiation protection of persons is concerned, animals for the purpose of medical or veterinary diagnosis, treatment or research

(b) the exploitation and closure of uranium mines

(c) the deliberate addition of radioactive substances in the production or manufacture of consumer products or other products, including medicinal products

(d) the operation of an accelerator (except when operated as part of a practice within sub-paragraph (e) or (f) below and except an electron microscope);

(e) industrial radiography

(f) industrial irradiation

(g) any practice involving a high-activity sealed HASS source (other than one within sub-paragraph (e) or (f) above);

(h) the operation, decommissioning or closure of any facility for the long-term storage or disposal of radioactive waste (including facilities managing radioactive waste for this purpose) but not any such facility situated on a site licensed under section 1 of the Nuclear Installations Act 1965

(i) practices discharging significant amounts of radioactive material with airborne or liquid effluent into the environment.

What's the matter? What's the antimatter? Does it antimatter?

– Wes Nisker