thoron
as defined in Council Directive 2013/59/Euratom of 5 December 2013 laying down basic safety…, Article 4, point (97) (Definitions)
(97)
"thoron" means the radionuclide Rn-220 and its progeny, as appropriate;
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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 (140)
the isotope Rn-220