Vacuum ultraviolet photon-mediated production of [F-18]F-2
: Krzyczmonik A, Keller T, Kirjavainen AK, Forsback S, Solin O
Publisher: WILEY
: 2017
: Journal of Labelled Compounds and Radiopharmaceuticals
: JOURNAL OF LABELLED COMPOUNDS & RADIOPHARMACEUTICALS
: J LABELLED COMPD RAD
: 60
: 4
: 186
: 193
: 8
: 0362-4803
: 1099-1344
DOI: https://doi.org/10.1002/jlcr.3489
: http://onlinelibrary.wiley.com/doi/10.1002/jlcr.3489/epdf
: https://research.utu.fi/converis/portal/detail/Publication/22366543
The chemistry of F-2 and its derivatives are amenable to facile aliphatic or aromatic substitution, as well as electrophilic addition. The main limitation in the use of [F-18]F-2 for radiopharmaceutical synthesis is the low specific activity achieved by the traditional methods of production. The highest specific activities, 55GBq/mol, for [F-18]F-2 have been achieved so far by using electrical discharge in the post-target production of [F-18]F-2 gas from [F-18]CH3F. We demonstrate that [F-18]F-2 is produced by illuminating a gas mixture of neon/F-2/[F-18]CH3F with vacuum ultraviolet photons generated by an excimer laser. We tested several illumination chambers and production conditions. The effects of the initial amount of [F-18]F-, amount of carrier F-2, and number of 193-nm laser pulses at constant power were evaluated regarding radiochemical yield and specific activity. The specific activity attained for [F-18]F-2-derived [F-18]NFSi was 10.3 +/- 0.9GBq/mol, and the average radiochemical yield over a wide range of conditions was 6.7% from [F-18]F-. The production can be improved by optimization of the synthesis device and procedures. The use of a commercially available excimer laser and the simplicity of the process can make this method relatively easy for adaptation in radiochemistry laboratories.
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