Tritium can be a radioactive isotope of hydrogen.Logical formLearned from17 sentences. A (research reactor) may make medical isotopes.Logical formLearned from17 sentences. (Carbon isotope ratios) can be stable.Logical formLearned from16 sentences. A mixture can be constituted-of-or-filled-with isotopes.Logical formLearned from16 sentences. Isotopes may pertain-to elements.Logical formLearned from15 sentences. Isotopes can be atomic.Logical formLearned from15 sentences. Ratios can be constituted-of-or-filled-with isotopes.Logical formLearned from15 sentences. Isotopes may undergo (decay rates).Logical formLearned from15 sentences. Traces may pertain-to a radioactive isotope.Logical formLearned from15 sentences. Some isotopes can be constituted-of-or-filled-with oxygen.Logical formLearned from15 sentences. Isotopes may undergo a distribution.Logical formLearned from15 sentences. An isotope may behave in ways.Logical formLearned from15 sentences. Isotopes can be nonradioactive.Logical formLearned from15 sentences. (Isotope beams) can be rare.Logical formLearned from14 sentences. Radioactive isotopes may undergo a production.Logical formLearned from14 sentences.