thoron
as defined in Proposal for a COUNCIL DIRECTIVE laying down basic safety standards for…, Article 4, point (140)
the isotope Rn-220
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Also defined in
- Council Directive 2013/59/Euratom of 5 December 2013 laying down basic safety standards for protection against the… 32013L0059, Article 4, point (97)
the radionuclide Rn-220 and its progeny, as appropriate