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Radioactive Iodine - Thyroids

  1. Dec 16, 2008 #1
    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?
  2. jcsd
  3. Dec 17, 2008 #2


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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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