| slovo | definícia |
radiothorium
(encz) | radiothorium, n: |
radiothorium
(gcide) | radiothorium \ra`di*o*tho"ri*um\
(r[=a]`d[i^]*[o^]*th[^o]r"[=e]*[u^]m), n. (Chem.)
an earlier name for the thorium isotope thorium-228, given
by its discoverer Otto Hahn. It is a radioactive substance
formed as one of series of products in the chain of
radioactive decay of thorium. Its immediate predecessor in
the chain is Actinium-228, and it decays by alpha emission to
radium-224 with a half-life of 1.91 years. The name
radiothorium was given prior to the full understanding of the
nature of isotopes of elements.
[PJC] |
radiothorium
(wn) | radiothorium
n 1: radioactive isotope of thorium with mass number 228 [syn:
thorium-228, radiothorium] |
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