Isotopes of fluorine

Fluorine has one stable isotope, which is fluorine-19 (¹⁹F). This isotope accounts for nearly all naturally occurring fluorine. Fluorine-19 has 9 protons and 10 neutrons in its nucleus. In addition to the stable isotope, fluorine has several radioactive isotopes, though they are not found in significant amounts in nature.

Fluorine-18 is a radioactive isotope of fluorine, which is a chemical element with the symbol F and atomic number 9. Fluorine-18 has a mass number of 18, indicating it has 9 protons and 9 neutrons in its nucleus. This isotope is notable for its applications in positron emission tomography (PET), a medical imaging technique. Fluorine-18 is produced in a cyclotron through the irradiation of oxygen-18.