Radioactive isotopes may be produced within a reactor.Logical formLearned from6 sentences. A (carbon isotope) can be stable.Logical formLearned from6 sentences. An isotope may have a half-life of some years.Logical formLearned from6 sentences. Hydrogen may have some isotopes.Logical formLearned from6 sentences. Isotopes may be produced.Logical formLearned from6 sentences. Fullerenes may contain (isotope ratios).Logical formLearned from6 sentences. (Isotope ratios) can be typical of meteorites.Logical formLearned from6 sentences. Isotopes can be in (earth rocks).Logical formLearned from6 sentences. (Oxygen isotopes) can be in (dinosaur bones).Logical formLearned from6 sentences. Isotopes may undergo a use.Logical formLearned from6 sentences. A radioactive isotope may be absorbed by a (thyroid gland).Logical formLearned from6 sentences. Radioactive isotopes may infiltrate a (food supply).Logical formLearned from6 sentences. Cancer may use radioactive isotopes.Logical formLearned from6 sentences. (Isotope fractionations) may pertain-to a us-state.Logical formLearned from6 sentences. Research can be in an area of (laser isotope separation).Logical formLearned from6 sentences.