👉 Radioisotopes are isotopes of a radioactive substance that have been exposed to an external source of energy, such as a nuclear reactor. These isotope pairs can be used in various applications, including medical diagnostics (radioactive iodine for thyroid function tests), nuclear medicine, and environmental monitoring. In the context of radioactivity, it's important to note that radioisotopes are not radioactive by definition but rather have been modified in such a way that they emit radiation when exposed to an external
