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单词 radioactinium
释义

Definition of radioactinium in English:

radioactinium

noun
historical

  • An isotope of thorium (thorium-227) which is produced by beta decay of actinium and itself decays by alpha emission with a half-life of 18.7 days.

Origin

Early 20th century.

Definition of radioactinium in US English:

radioactinium

noun
historical

  • An isotope of thorium (thorium-227) which is produced by beta decay of actinium and itself decays by alpha emission with a half-life of 18.7 days.

Origin

Early 20th century.
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更新时间：2024/12/26 22:52:51