First, different amount of Iodogen was used to act on certain 125 I and FG, then the right amount of Iodogen in single labeling, equal to 1% of FG, was determined according to the labeling rate and activity rate of the products.

• 先用不同量的Iodogen作用于一定量的12 5I和FG ,根据产物标记率和活性率 ,选择Iodogen单次用量为FG的 1%25 ;