mesothorium


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mes·o·tho·ri·um

 (mĕz′ə-thôr′ē-əm, mĕs′-)
n.
Either of two decay products of thorium, mesothorium I, an isotope of radium, or mesothorium II, an isotope of actinium.

mesothorium

(ˌmɛsəʊˈθɔːrɪəm)
n
(General Physics) physics obsolete either of the two radioactive elements which are decay products of thorium. Mesothorium I is now called radium-228. Mesothorium II is now called actinium-228
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References in periodicals archive ?
During this treatment most Nb, Ta and LREE are dissolved, but thorium remains as insoluble fluoride in the moist thorium cake (2.5% Th[O.sub.2]) that also contains about 27% BaS[O.sub.4] from [sup.228]Ra (mesothorium) coprecipitation, 12% [(LREE).sub.2][O.sub.3], 6.8% F, 3% Ti[O.sub.2], 3.7% CaO and 7.9% Si[O.sub.2].