Isotopes may undergo analyes.Logical formLearned from3 sentences. A fissile isotope may undergo concentration.Logical formLearned from3 sentences. (Krypton isotopes) can be radioactive.Logical formLearned from3 sentences. An isotope may undergo a distribution.Logical formLearned from3 sentences. A percent may pertain-to medical isotopes.Logical formLearned from3 sentences. An isotope may be produced.Logical formLearned from3 sentences. Some countries can be for (isotope production).Logical formLearned from3 sentences. A stable isotope can be constituted-of-or-filled-with oxygen.Logical formLearned from3 sentences. An isotope may pertain-to an (element thorium).Logical formLearned from3 sentences. A relative abundance may pertain-to isotopes.Logical formLearned from3 sentences. Some isotopes can be unstable.Logical formLearned from3 sentences. Some isotopes may be produced.Logical formLearned from3 sentences. Isotopes may be found in nature.Logical formLearned from3 sentences. A mass number may pertain-to an isotope.Logical formLearned from3 sentences. Tritium can be (hydrogen isotope).Logical formLearned from3 sentences.