Radiation Protection Glossary

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

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For formal advice, see our Radiation Protection Adviser pages. 


A general term applied to situations were nuclear plant (or any other plant containing sources of Ionising Radiations) comes to the end of its useful life. Decommissioning is then required in order to dismantle the plant and recover Radioactive materials for either reuse, recycling or disposal. Decommissioning uses an extremely controlled approach and on larger plants (e.g. nuclear power stations) will require full Safety Cases and regulator attention.

Imagination is more important than knowledge

– Albert Einstein -