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出典:Wiktionary
出典:『Wiktionary』 (2024/06/11 15:37 UTC 版)
meso- + thorium. Probably so-called because these two isotopes (Ra and Ac) are, in the decay chain, intermediate between normal thorium (Th) and radiothorium (Th).
mesothorium (plural mesothoriums)
Mesothorium I is radium-228. Mesothorium II is actinium-228.
mesothorium