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In August 1959, Dr. Chang-Soon Koh, a first-year resident, measured radioiodine uptake in thyroid disease patients under supervision of Prof. Munho Lee. This was the first clinical application of radioisotopes in Korea. Dr. Koh was able to use a well-type gamma counter that was installed in the Department of Physiology, Seoul National University College of Medicine (SNUCM), with the help of Dr. Sang Don Rhee, a lecturer in the Department of Physiology.