Definition of "radiothorium" []

• A radioactive isotope of thorium with mass number 228. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Hahn's radiothorium and actinium salts also followed him to Emil Fischer's laboratory in Berlin. 30"
• "Hahn had identified a new radioelement that emitted thorium emanation and which he labeled radiothorium. 28 Meanwhile, Soddy had moved to the Chemical Institute of University College in London to join Ramsay's research."
• "With Ramsay's consent, Hahn had taken with him the radiothorium he separated from samples of barium chloride and the actinium that he and a collaborator had earlier proved to be identical to the new element that the German chemist Friedrich Giesel had named emanium."