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 (I-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 apologetically leaves to deal with an emergent issue, but Mr. Miller still has some concerns. Answer the following to alleviate Mr. Miller’s concerns:

Dr. Goodie estimates Mr. Miller will need to be infused with approximately 5 grams of I-131 over a 3-hour period of time to reach a sufficient therapeutic level of radiation.

How many grams of iodine-131 would remain in Mr. Miller’s body after 4.8 half-lives?