A cache can be constituted-of-or-filled-with isotopes.Logical formLearned from4 sentences. Persons may produce (radio isotopes).Logical formLearned from4 sentences. A (research reactor) may be used for producing medical isotopes.Logical formLearned from4 sentences. A lethal dose may pertain-to an (isotope polonium-210).Logical formLearned from4 sentences. A lethal dose may pertain-to an (isotope polonium).Logical formLearned from4 sentences. Doses may pertain-to an (isotope polonium).Logical formLearned from4 sentences. (Feedstock gas) may be refined into a form of an (isotope u-235).Logical formLearned from4 sentences. A form may pertain-to an (isotope u-235).Logical formLearned from4 sentences. Some percent can be an isotope.Logical formLearned from4 sentences. An experiment may use (laser isotope separation technology).Logical formLearned from4 sentences. A radioactive isotope can be heavy.Logical formLearned from3 sentences. Doses of an isotope can be dangerous.Logical formLearned from3 sentences. Radioactive isotopes may undergo a distribution.Logical formLearned from3 sentences. A shift can be in (oxygen isotope ratios).Logical formLearned from3 sentences. A total can be constituted-of-or-filled-with some isotopes.Logical formLearned from3 sentences.