A Method for reacting Submicrogram Quantities of Radioactive Substances; Observations on the Preparation of [ 131 ]–Iodotyrosines of Very High Specific Activities

WE described recently a method of preparation of [131]–iodotyrosines of very high specific activity1,2. Further work has shown a considerable difference in the specific activities of these substances obtained in a number of iodinations though the experimental conditions were kept as nearly identical as possible.