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Measuring the Daily Rate of Radioactive Iodine (131I) Uptake in the Thyroid Glands and Excretion through the Urine of Korean Adult Males

In this study, in order to assess a proper absorbed dose of a radionuclide tailored to the physiological characteristics of Korean adult males, we measured the daily rate of radioactive iodine (131I) uptake by the thyroid glands and its eventual excretion through the urinary tract of a group of Korean male adults. We orally administered 131I to 28 adult males, measured the resultant radioactivity affecting the thyroid glands and urine over a series of time intervals (2, 4, 6, and 24 h), and calculated the daily uptake by the thyroid glands and excretion through the urine. Our findings suggest an average uptake of 19.7% by the thyroid glands and a urinary excretion of 71.1% 24 h after administering the radioactive iodine. The uptake of the radioactive iodine through the thyroid glands found in this study differed from the previous result reported in ICRP-67/78, but the urinary excretion was somewhat similar.