Radioactive Iodine - Thyroids

  • Thread starter alara_rc
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  • #1
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?
 

Answers and Replies

  • #2
CRGreathouse
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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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