Use the method as described under 1.15 Electrophoresis, but using counting devices and detectors suitable for radiopharmaceuticals. These methods are particularly suitable for charged radiopharmaceuticals (anionic, e.g. technetium (^99mTc) mebrofenin complex, radioiodinated o-hippuric acid, technetium (^99mTc) mertiadale injection or cationic, e.g. technetium (^99mTc) sestamibi complex injection.