Preparation of [(3) H]fluoroethyl tosylate and its use in the labelling of the dopamine transporter radioligand [(3) H]FE-PE2I.

[(3) H]Fluoroethyl tosylate, a novel alkylating tritium labelling agent, was synthesized from tritium gas with high specific activity and with 99% radiochemical purity. [(3) H]Fluoroethyl tosylate was applied in the tritium labelling of the dopamine transporter radioligand [(3) H]FE-PE2I.