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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:2025/1/28 10:09:01