Case Study 1 Dr. Goodie wants to treat Mr. Miller's thyroid cancer by using Radioactive Iodine (RAI) treatment after an unsuccessful surgery to remove the cancer. Dr. Goodie explains that this treatment consists of injecting radioactive iodine (1-131) into the bloodstream. Since the thyroid is the only place the body stores iodine, it is a relatively safe way to destroy cancer cells within the thyroid. Dr. Goodie estimates Mr. Miller will need to be infused with approximately 6.0 grams of I-131 over a 3-hour period of time to reach a sufficient therapeutic level of radiation. Dr. Goodie apologetically leaves to deal with an emergent issue, but Mr. Miller still has some concerns. Answer the Questions to Alleviate Mr. Miller's Concerns 1. A drug is considered to be "eliminated" from the body after 5 half-lives. How much iodine-131 would remain in Mr. Miller's body after that period of time? 2. If the half-life of I-131 is 8 days, how long would it take before the radiation is considered eliminated? 3. How many atoms of I-131 would be left in Mr. Miller's body after 60 days