(Isotope signatures) may reveal changes.Logical formLearned from8 sentences. (Isotope signatures) may pertain-to a tissue.Logical formLearned from8 sentences. (Isotope signatures) can be from a (hair shaft).Logical formLearned from8 sentences. Isotopes can be forms of an element.Logical formLearned from8 sentences. Isotopes can be elemental.Logical formLearned from8 sentences. Half-lives may pertain-to isotopes.Logical formLearned from8 sentences. Isotopes may undergo a measurement.Logical formLearned from8 sentences. (Oxygen isotopes) may undergo measurements.Logical formLearned from8 sentences. Radioactive isotopes may undergo (decay rates).Logical formLearned from8 sentences. Properties may pertain-to an isotope.Logical formLearned from8 sentences. A mixture can be constituted-of-or-filled-with some isotopes.Logical formLearned from8 sentences. A (medical research reactor) may produce isotopes.Logical formLearned from8 sentences. An isotope may undergo a use.Logical formLearned from8 sentences. Organs may fail after ingesting a (radioactive isotope).Logical formLearned from8 sentences. Isotopes may be used for applications.Logical formLearned from8 sentences.