Half-Life, Biological 1
Half-Life, Biological 1 : The period during which a biological system, for instance a human being or animal, naturally excretes half of the absorbed quantity of a certain substance from the body or a specific organ. For adults the following biological half-lives apply: (1) Tritium (whole body): 10 days, (2) Caesium (whole body): 110 days, (3) Iodine (thyroid gland): 80 days, (4) Plutonium: 20 years (liver), 50 years (skeleton).
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