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Radiothorium Definition

(noun)
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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.


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