A small amount of stannous chloride (SnCl2) is added to a vial containing a radiopharmaceutical precursor, such as pertechnetate (TcO4^-).
The stannous ions act as a reducing agent, converting TcO4^- to a reduced form of technetium (Tc-99m).
The radiotracer, now in the form of Tc-99m, can be easily incorporated into red blood cells or other carriers.
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