radiation source
as defined in Council Directive 2013/59/Euratom of 5 December 2013 laying down basic safety…, Article 4, point (75) (Definitions)
an entity that may cause exposure, such as by emitting ionising radiation or by releasing radioactive material
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Also defined in
- Proposal for a COUNCIL DIRECTIVE laying down basic safety standards for protection against the dangers arising from… 52011PC0593, Article 4, point (58)
an entity that may cause radiation exposure — such as by emitting ionising radiation or by releasing radioactive material — and can be treated as a single entity for protection and safety purposes