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actinium [æk'tɪnɪəm] Sub.
Chem. actiniu
actinium A radioactive element of the actinide series, occurring as a decay product of uranium. It is used as an alpha particle source and in neutron production Sub.
Umwelt actiniu
 Englisch Thesaurus
Actinium [æk'tɪnɪəm] Abk.
Abkürz., Schott. Ac