| 单词 | thorium-228 |
| 释义 | thorium-228 (extremely rare) n WORD FAMILY thorium-228 n radioactive isotope of thorium with mass number 228 Syn|Hyper radiothorium Th, atomic number 90, thorium a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands |
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