bn:00065961n
Noun Concept
Categories: Isotopes of thorium, Lists of isotopes by element, Thorium
EN
thorium-228  radiothorium
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EN
The radioactive isotope thorium-228. Wiktionary
A radioactive isotope of thorium, 22890Th, having a half-life of 1.4 x 1010 years; it occurs naturally, and is a source of nuclear energy. Wiktionary
IS A
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