Search results
Results from the WOW.Com Content Network
Fluorine-18 (18 F, also called radiofluorine) 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 96.7% of the time and electron capture 3.3% of the time.
The longest-lived radioisotope is 18 F; it has a half-life of 109.734(8) min. All other fluorine isotopes have half-lives of less than a minute, and most of those less than a second. The least stable known isotope is 14 F, whose half-life is 500(60) yoctoseconds, [4] corresponding to a resonance width of 910(100) keV.
The [18 F]FDG-6-phosphate formed when [18 F]FDG enters the cell cannot exit the cell before radioactive decay. As a result, the distribution of [18 F]FDG is a good reflection of the distribution of glucose uptake and phosphorylation by cells in the body. [citation needed] The fluorine in [18 F]FDG decays radioactively via beta-decay to 18 O −.
Fluorine-18 is the most common isotope used for this procedure. This is due to its 97% positron emission and relatively long 109.8 min half-life. The half-life allows for a long enough time to be incorporated into the molecule and be used without causing exceedingly harmful effects.
[51] [52] 18 F is a natural trace radioisotope produced by cosmic ray spallation of atmospheric argon as well as by reaction of protons with natural oxygen: 18 O + p → 18 F + n. [53] Other radioisotopes have half-lives less than 70 seconds; most decay in less than half a second. [54] The isotopes 17 F and 18 F undergo β + decay and electron ...
Radioactive isotope table "lists ALL radioactive nuclei with a half-life greater than 1000 years", incorporated in the list above. The NUBASE2020 evaluation of nuclear physics properties F.G. Kondev et al. 2021 Chinese Phys. C 45 030001. The PDF of this article lists the half-lives of all known radioactives nuclides.
Fluorodeoxyglucose ([18 F]FDG or FDG) is commonly used to detect cancer; [18 F]Sodium fluoride (Na 18 F) is widely used for detecting bone formation; Oxygen-15 (15 O) is sometimes used to measure blood flow. PET is a common imaging technique, a medical scintillography technique used in nuclear medicine.
This page was last edited on 23 January 2021, at 06:48 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.