Isotopes can be therapeutic.Logical formLearned from7 sentences. An isotope may pertain-to a helium.Logical formLearned from7 sentences. An indicator of an amount of organic carbon can be a ratio of an isotope of carbon.Logical formLearned from7 sentences. An isotope may pertain-to uranium.Logical formLearned from7 sentences. Radioactive isotopes can be for medical treatments.Logical formLearned from7 sentences. An isotope can be synthetic.Logical formLearned from7 sentences. (Oxygen isotopes) may undergo analyes.Logical formLearned from7 sentences. Isotopes can be constituted-of-or-filled-with nitrogen.Logical formLearned from7 sentences. Isotopes may undergo abundances.Logical formLearned from7 sentences. A radioactive isotope may be poisoned.Logical formLearned from7 sentences. A radioactive isotope can be in a world-city.Logical formLearned from7 sentences. An (oxygen isotope) can be heavy.Logical formLearned from7 sentences. A percent may pertain-to an isotope.Logical formLearned from7 sentences. A (radioactive isotope) can be in a world-city.Logical formLearned from7 sentences. (Carbon isotope ratio testing) may undergo a use.Logical formLearned from7 sentences.