Fluorine-18

Fluorine-18

Infobox isotope
background = #eee
text_color =
isotope_name = Fluorine-18
isotope_filename =
alternate_names = Fluorine-18
mass_number = 18
symbol = F
num_neutrons = 9
num_protons = 9
abundance = Radioisotope
halflife = 109.771(20) min
decay_mode1 = Positron emission
decay_energy1 = 1.656
decay_product = Oxygen-18
decay_symbol = Oxygen
decay_mass = 18
mass = 18.0009380(6)
spin = 1+
excess_energy = 873.431
error1 = 0.593
binding_energy = 137369.199
error2 = 0.593

Fluorine-18 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.

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 [Fowler J. S. and Wolf A. P. (1982) The synthesis of carbon-11, fluorine-18 and nitrogen-13 labeled radiotracers for biomedical applications. Nucl. Sci. Ser. Natl Acad. Sci. Natl Res. Council Monogr. 1982.] with high energy protons (typically ~18 MeV). Fluorine-18 is often substituted for hydroxyl due to similar steric and electrostatic properties. This may however be problematic in certain applications due to possible changes in molecule polarity.

References


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