Ratios may pertain-to isotopes.Logical formLearned from3 sentences. Some elements may have isotopes.Logical formLearned from3 sentences. Areas can be as medical isotopes.Logical formLearned from3 sentences. An isotope may be take_uped into bones.Logical formLearned from3 sentences. Isotopes may pertain-to persons.Logical formLearned from3 sentences. Medical isotopes can be in a continent.Logical formLearned from3 sentences. (Isotope techniques) may be used.Logical formLearned from3 sentences. Stable isotopes may be used in studies.Logical formLearned from3 sentences. A site can be for an (isotope separation process).Logical formLearned from3 sentences. Isotopes can be hydrogen-1.Logical formLearned from3 sentences. Radioactive isotopes can be diagnostic.Logical formLearned from3 sentences. (Tracking systems) can be for radioactive isotopes.Logical formLearned from3 sentences. Some percent can be constituted-of-or-filled-with some isotope.Logical formLearned from3 sentences. A source may pertain-to an isotope.Logical formLearned from3 sentences. Isotopes may be listed.Logical formLearned from3 sentences.