From Wikipedia, the free encyclopedia - View original article
Decay over 24 hours
|Isotope mass||18.0009380(6) u|
|Excess energy||873.431± 0.593 keV|
|Binding energy||137369.199± 0.593 keV|
|Decay mode||Decay energy|
|Positron emission (97%)||0.6335 MeV|
|Electron capture (3%)||1.6555 MeV|
Fluorine-18 (18F) is a fluorine radioisotope which is an important source of positrons. It has a mass of 18.0009380(6) u and its half-life is 109.771(20) minutes. It decays by positron emission 97% of the time and electron capture 3% of the time. Both modes of decay yield stable oxygen-18.
Fluorine-18 is an important isotope in the radiopharmaceutical industry, and is primarily synthesized into fluorodeoxyglucose (FDG) for use in positron emission tomography (PET scans). It is substituted for hydroxyl and used as a tracer in the scan. Its significance is due to both its short half-life and the emission of positrons when decaying. In the radiopharmaceutical industry, it is made using either a cyclotron or linear particle accelerator to bombard a target, usually of pure or enriched oxygen-18-water  with high energy protons (typically ~18 MeV protons).
Fluorine-18 is often substituted for a hydroxyl group in a radiotracer parent molecule, due to similar steric and electrostatic properties. This may however be problematic in certain applications due to possible changes in molecule polarity.
|This isotope-related article is a stub. You can help Wikipedia by expanding it.|
|Fluorine-18 is an|
isotope of fluorine
|Decay product of:|