THE RATES OF ABSORPTION OF THE RADIOACTIVE ISOTOPES OF SODIUM, POTASSIUM, CHLORINE, BROMINE, AND IODINE IN NORMAL HUMAN SUBJECTS

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Abstract
These radioactive elements were prepared by the use of a cyclotron and then made up as isotonic solns. and given by mouth to normal human Subjects in the fasting state. The appearance, and rate of increase of the number of radioactive atoms in the subjects'' hands was measured by a Geiger counter and the values obtained were assumed to represent the rates of absorption. The radioactive atoms of Na, Cl, Br, and I appeared in the hand within 3 to 6 mins. after ingestion and absorption was apparently completed within 3 hrs. The radioactive atoms of K took from 6 to 15 mins. to appear in the hand and complete absorption required more than 5 hrs.