1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Radioactive iodine

  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


    User Avatar
    Science Advisor
    Gold Member

    The half-life of a radioisotope does not change. There is a different measure called the biological half life. This refers to how long it takes your body to excrete the material and is unrelated to radioactivity.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook