That's interesting. My Primary Care Doctor, my ENT doc, and my Endo, said 3 to 4 months. I would just worry about wasting your money on a treatment that isn't effective because your Thyroid isn't starved enough. You could have gotten a CT that wasn't a contrast, so they wouldn't have used Iodine. It wouldn't hurt to get a second opinion on this one. I wouldn't want to waste the money on a treatment that is not going to work.
My Endo, did a bunch of blood test last week, and i'll find out on May 14th, when I'll get my RAI. I think one of the test shows how much Iodine is still in your system, but I'm really not sure.