Abstract
Summary
1. The percentage of a tracer dose of radioactive iodine deposited in the thyroid gland at the end of 24 hours was determined by measurement of radio-activity directly over the gland in 1,050 tests in 1952 apparently euthyroid individuals. 2. It is concluded that, within the New York area, there is statistically no effect of season, on the average uptake of radioiodine by the thyroid gland of the euthyroid individual. 3. The 24-hour uptake of radioiodine decreases progressively but slightly with each decade of age. The extent of fall is statistically, but not clinically, significant. 4. Women in all age groups show a slightly higher average uptake than men. The difference is not clinically significant.
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