radioactive substance
as defined in Council Directive 2013/59/Euratom of 5 December 2013 laying down basic safety…, Article 4, point (78) (Definitions)
(78)
"radioactive substance" means any substance that contains one or more radionuclides the activity or activity concentration of which cannot be disregarded from a radiation protection point of view;
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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 (103)
any substance that contains one or more radionuclides the activity concentration of which cannot be disregarded as far as radiation protection is concerned