IODIDE absorption is rapid and complete through the small intestine1 and the pulmonary alveolar capillary interface2 and incomplete through the intact skin.3 After absorption, iodide is distributed to the extracellular fluid from which it is sequestered by the thyroid for hormone synthesis.1 The measurement of thyroid radioactive iodine burdens, therefore, offers a simple index of contamination.
Measurements were made of thyroid131I burdens in a number of medical and paramedical personnel exposed to radioactive iodine in their work, since information concerning low level activity is not available. Burdens were generally expected to be very low, and therefore, a sensitive detection system previously described was used.4
Method of Measurement
Thyroid131I burdens were measured in a low background steel room, with two 3 × 3-inch thallium-activated sodium iodide scintillation crystals placed in contact with the anterior surface of the neck from the sternal notch
Blum M, Liuzzi A. Thyroid 131I Burdens in Medical and Paramedical Personnel. JAMA. 1967;200(11):992–994. doi:10.1001/jama.1967.03120240120031
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