PRIVACY ACT MATERIAL REMOVED technetium and radioiodine uptakes in a typical euthyroid individual are seen in Fig. 6. As expected the technetium uptake is very rapid in the first ten minutes (T1/2-5 min.) and then levels off. The Lodine uptake 1s also very rapid in this same period of time with the level of uptake somewhat higher than the technetium uptake. It too, levels off to a slope The second component of approaching zero in the time scale of the graph. this curve can not be accurately determined because it has a T1/2 of about 6 - 10 hours and recording was only for 1/2 hour. Several interesting examples have been noted already in our short series. One patient (Fig. 7) with hyperthyroidism confirmed by several in-vitro studies had a technetium curve which was distinctly abnormal (maximum uptake 5.1%) while the radioiodine uptake during the first half hour was consistently lower than the technetium uptake. The twenty-four hour radioiodine uptake in this patient was only 24.9%. A more typical example of hyperthyroidism is patient (Fig. 8) where the iodine uptake was always higher than the technetium uptake with both being high. Another interesting varient is the data on patient (Fig. 9), thought to have Hashimotos' thyroiditis although autoantibodies were negative and the serum thyroxine level was normal. uptake was elevated (47.6%). The 24 hour radioiodine The curves show an early peak of technetium uptake at about 12 minutes and then a decline. The radioiodine uptake was consistently high, reahing 9.1% at 30 minutes. The study fs continuing and it is hoped to learn more about the early thyroid uptake of iodine and technetium. We are also obtaining close-up scintiphotos of the thyroid at 30 minutes with technetium, and at 30 minutes and 24 hours with radioiodine. It should be interesting to see any correspondance between the 30 minute images of the two radiopharmaceuticals 5901300 D. RIAL REMOVE MATE PRIVACY ACT