A radioactive isotope may be injected into a vein.Logical formLearned from3 sentences. An isotope can be elemental.Logical formLearned from3 sentences. An isotope can be environmental.Logical formLearned from3 sentences. (Isotope beam capabilities) can be rare.Logical formLearned from3 sentences. Isotopes can be separated.Logical formLearned from3 sentences. Experiments can be with isotopes.Logical formLearned from3 sentences. An (isotope effect) can be solvent.Logical formLearned from3 sentences. (Isotope ratios) may undergo a use.Logical formLearned from3 sentences. Tritium can be a radioactive isotope of hydrogen.Logical formLearned from3 sentences. A proportion may pertain-to isotopes.Logical formLearned from3 sentences. An (oxygen isotope record) can be stable.Logical formLearned from3 sentences. A (carbon isotope excursion) can be positive.Logical formLearned from3 sentences. (Carbon isotope values) may be recorded by foraminifers.Logical formLearned from3 sentences. (Carbon isotope values) can be negative.Logical formLearned from3 sentences. (Carbon isotopes) may undergo a distribution.Logical formLearned from3 sentences.