Forms may be knowned as isotopes.Logical formLearned from4 sentences. Isotopes can be present in amounts.Logical formLearned from4 sentences. (Radioactive isotopes) can be long-lived.Logical formLearned from4 sentences. An isotope can be carbon-13.Logical formLearned from4 sentences. Isotopes may be used in making drugs.Logical formLearned from4 sentences. Radioactive isotopes may be produced in nuclear reactors.Logical formLearned from4 sentences. An isotope may be used in bombs.Logical formLearned from4 sentences. Isotopes can be constituted-of-or-filled-with rubidium.Logical formLearned from4 sentences. (Isotope ratios) may undergo determination.Logical formLearned from4 sentences. Radioactive isotopes can be in agriculture.Logical formLearned from4 sentences. Stable isotopes can be constituted-of-or-filled-with tooth.Logical formLearned from4 sentences. Stable isotopes of tooth can be apatite.Logical formLearned from4 sentences. An isotope may be involved.Logical formLearned from4 sentences. Isotopes may be associated with emissions.Logical formLearned from4 sentences. A magnetic field can be for diversion/separation of isotopes.Logical formLearned from4 sentences.