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PET requires biochemically selective radiotracers to realize full potential. Fluorine-18 (<jats:italic>t<\/jats:italic><jats:sub>1\/2<\/jats:sub>\u2009=\u2009109.8\u2009min) is a major radionuclide for labeling such radiotracers but is only readily available in high activities from cyclotrons as [<jats:sup>18<\/jats:sup>F]fluoride ion. [<jats:sup>18<\/jats:sup>F]fluoroform has emerged for labeling tracers in trifluoromethyl groups. Prior methods of [<jats:sup>18<\/jats:sup>F]fluoroform synthesis used difluoro precursors in solution and led to high dilution with carrier and low molar activity (<jats:italic>A<\/jats:italic><jats:sub>m<\/jats:sub>). We explored a new approach for the synthesis of [<jats:sup>18<\/jats:sup>F]fluoroform based on the radiosynthesis of [<jats:sup>18<\/jats:sup>F]fluoromethane from [<jats:sup>18<\/jats:sup>F]fluoride ion and then cobalt<jats:sup>III<\/jats:sup> fluoride mediated gas phase fluorination. We estimate that carrier dilution in this process is limited to about 3-fold and find that moderate to high <jats:italic>A<\/jats:italic><jats:sub>m<\/jats:sub> values can be achieved. 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