Isotopes can be constituted-of-or-filled-with oxygen.Logical formLearned from32 sentences. A male may be assigned to isotopes.Logical formLearned from32 sentences. An (isotope polonium) can be radioactive.Logical formLearned from31 sentences. Radioactive isotopes may undergo a decay.Logical formLearned from30 sentences. An isotope can be constituted-of-or-filled-with uranium.Logical formLearned from29 sentences. Isotopes can be stable.Logical formLearned from29 sentences. An isotope can be constituted-of-or-filled-with helium.Logical formLearned from29 sentences. A reactor may make medical isotopes.Logical formLearned from29 sentences. Isotopes can be constituted-of-or-filled-with plutonium.Logical formLearned from27 sentences. A (research reactor) may produce medical isotopes.Logical formLearned from26 sentences. (Uranium isotopes) may undergo a separation.Logical formLearned from26 sentences. Isotopes can be fissionable.Logical formLearned from26 sentences. Some isotopes can be constituted-of-or-filled-with hydrogen.Logical formLearned from26 sentences. A reactor may make medical isotopes.Logical formLearned from25 sentences. An isotope can be desired.Logical formLearned from25 sentences.