A single oral dose of a tritiated luminous compound in common usage by the luminous dial painting industry was given to rats and cats, and the tritium concentration followed in the urine, feces and various body tissues. A major fraction of the absorbed tritium was eliminated with a biological half-life essentially the same as that of tritiated water.
Body burdens of 137Cs were measured in September and October 1966 at two of twenty-one children's homes in which the National Center for Radiological Health determines monthly dietary intakes of cesium-137. Cesiurn-137 intakes in Tampa, Florida, were highest among the twenty-one institutions; in Lake Bluff, Illinois, the intakes were near the average for all institutions. The subjects were thirty children in one home and thirty-five in the other at ages between 6 and 16 years. Height, weight, sex, age, and gross body morphology were recorded for each subject.Cesium-I37 and 40K contents were measured in a truck-mounted shadow shield by means of a 4 in. x 8 in. NaI(T1) detector and a 512-channel pulse height analyzer. The instrument was calibrated with phantoms consisting of 2-lb. boxes of granulated sugar, each with inserted radioactivity standards of 137Cs or *OK. The minimum detectable activity of the instrument system for 13'Cs in children was 1 nCi, and the standard deviation was approximately 0.4 nCi for 30-min counting times. Cesium-137 and potassium body contents and concentrations were log-normally distributed among the children within each institution. Geometric mean values of 13'Cs body burden were 7.7 nCi at the institution where 137Cs intakes were highest, and 3.4 nCi where 137Cs intakes were near the average. Cesium-137 body burdens were related to known intake levels to estimate a mean biological half-life of 46 days.
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