英语词汇“radiothorium”的翻译、意思、用法、释义-英汉双解词典-雅致网

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单词	radiothorium
释义	Definition of radiothorium in English: radiothorium noun historical An isotope of thorium (thorium-228) which occurs in small amounts in natural thorium and is formed by the beta decay of actinium-228, and which itself decays by alpha emission with a half-life of 1.9 years; (also) a mixture of radioactive isotopes of thorium, actinium, and radium, present as decay products in natural thorium. Origin Early 20th century; earliest use found in Journal of the Chemical Society. Definition of radiothorium in US English: radiothorium noun historical An isotope of thorium (thorium-228) which occurs in small amounts in natural thorium and is formed by the beta decay of actinium-228, and which itself decays by alpha emission with a half-life of 1.9 years; (also) a mixture of radioactive isotopes of thorium, actinium, and radium, present as decay products in natural thorium. Origin Early 20th century; earliest use found in Journal of the Chemical Society.
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更新时间：2025/6/19 6:18:32