Patent Number: 
Section: claims

1. A method for preparing [18F]F2 , comprising the steps of: isolating [18F] fluoride from a water target by electrolysis in a reactor; then drying the [18F] fluoride and thereafter filling the reactor with a carrier gas or a metal fluoride to form plasma or a mixture comprising plasma thereof wherein the reactor also contains a controlled amount of fluorine gas; next igniting the plasma with at least a plasma induction by microwaves wherein the reactor comprises a microwave cavity and optionally also igniting the plasma with a fluorescent light tube driver circuit, or a high voltage discharge; and thereafter emptying the contents in the reactor into a stream of gas wherein [18F]F2 is trapped. 2. The method according to claim 1, wherein the metal fluoride is a deposition on the wall of the reactor or a powder on the wall of the reactor. 3. The method according to claim 1, wherein the carrier gas is a noble gas or a halogen gas. 4. The method according to claim 1, wherein the metal within the metal fluoride is Na, Ca, K, Mg, Mn or a salt thereof. 5. The method according to claim 1, wherein the controlled amount of fluorine gas is about 200 nanomoles to about 10 micromoles. 6. The method according to claim 1, wherein the high voltage discharge has a voltage of about 10 kV to about 50 kV. 7. The method according to claim 1, wherein the stream of gas is a halogen gas or a noble gas. 8. The method according to claim 1, wherein the reactor generates no heat.