A basis can be for separation of isotopes.Logical formLearned from4 sentences. (Carbon isotope data) can be stable.Logical formLearned from4 sentences. Radioactive isotopes can be present in rocks.Logical formLearned from4 sentences. An isotope can be nonradioactive.Logical formLearned from4 sentences. Traces can be constituted-of-or-filled-with isotopes.Logical formLearned from4 sentences. Isotopes can be constituted-of-or-filled-with neptunium.Logical formLearned from4 sentences. Isotopes may range in mass number.Logical formLearned from4 sentences. Deuterium can be (hydrogen isotope).Logical formLearned from4 sentences. Atoms can be isotopes of an element.Logical formLearned from4 sentences. Radioactive isotopes may undergo concentrations.Logical formLearned from4 sentences. An isotope can be deadly.Logical formLearned from4 sentences. (Isotope producers) may lose an incentive.Logical formLearned from4 sentences. Fissile isotopes can be after irradiation.Logical formLearned from4 sentences. A proportion can be constituted-of-or-filled-with fissile isotopes.Logical formLearned from4 sentences. Work can be on a use of isotopes.Logical formLearned from4 sentences.