Isotopes can be constituted-of-or-filled-with bismuth.Logical formLearned from3 sentences. Some isotopes may be found in nature.Logical formLearned from3 sentences. Th can be an isotope of thorium.Logical formLearned from3 sentences. Kinetic (isotope effects) can be transient.Logical formLearned from3 sentences. Ratios can be constituted-of-or-filled-with (strontium isotopes).Logical formLearned from3 sentences. An isotope may undergo a production.Logical formLearned from3 sentences. An isotope can be constituted-of-or-filled-with lithium.Logical formLearned from3 sentences. Radioactive isotopes can be heavy.Logical formLearned from3 sentences. Doses may pertain-to an isotope.Logical formLearned from3 sentences. A list can be constituted-of-or-filled-with isotopes.Logical formLearned from3 sentences. Some study may use ratios of (strontium isotopes).Logical formLearned from3 sentences. A radioactive isotope can be constituted-of-or-filled-with phosphorus.Logical formLearned from3 sentences. A collaboration can be with regards to claims of isotopes of thorium.Logical formLearned from3 sentences. Regards can be to claims of isotopes of thorium.Logical formLearned from3 sentences. Isotopes may pertain-to an element.Logical formLearned from3 sentences.