Kit for radiolabelling

A radiolabelling kit comprising:

• a first vial, wherein said first vial is empty and under vacuum;
• a second vial, wherein said second vial comprises a suitable amount of acetate buffer for balancing the pH of an eluate from a gallium-68 generator to a pH value ranging from 3 to 5 when said eluate is eluted into the kit;
• and
• a third vial, wherein said third vial comprises a lyophilized chelate-functionalized targeting agent and a lyophilized metal inhibitor,
• wherein the chelator group of said chelate-functionalized targeting agent is selected from the group consisting of:
• NOTA, NODAGA, Tris(hydroxypyridinone) (THP), HBED, DFO 6SS, B6SS, PLED, YM103, and H2dedpa;
• and
• wherein said metal inhibitor is selected from the group consisting of:
• DOTA, tetra-tBu-DTPA, beta-cyclodextrin and a monosacccharide.