Half-life, biological

The periodreactor 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:

• TritiumRadioactive isotope of hydrogen with two neutrons and a prot... (whole body): 10 days,C
• aesium (whole body): 110 days,
• Iodine (thyroid gland): 80 days,
• PlutoniumPlutonium - the 94th element in the classification of elemen...: 20 years (liver), 50 years (skeleton).