Why Does Radioactive Iodine Decrease Faster in Some Bodies?

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Radioactive iodine, specifically iodine-131, is administered to reduce thyroid growth and activity. It has a physical half-life of 7.56 days; however, the radiation in the human body decreases more rapidly than this due to the body's natural excretion of iodine. This process involves both the decay of the radioactive isotope and its elimination from the body, leading to a shorter effective or biological half-life. Understanding the concept of biological half-life is crucial in this context.
alara_rc
thanx for help in advance,

we know that radioactive iodine is given to people to minimize their thyroid growth or plain thyroid activity. This certain iodine 131-53 I, has a half life of 7.56 days. so why would the radiation in the human body decrease at a faster rate than at the calculated rate?
 
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Because the body excretes iodine, so the 131I is lost through both decay and excretion. Google for "biological half-life".
 

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