The present invention provides an improved method for fluoridation of an iodonium salt wherein a solution of the iodonium salt comprising a free radical trap is stored before the reaction is carried out. The method of the invention may be automated, which is particularly convenient when the method of the invention is radiofluoridation. As such the present invention also provides a cassette comprising the iodonium salt solution suitable for carrying out the method of the invention on an automated synthesizer.
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