I had the 131 pill to kill my over active thyroid. They told me the people who take the pill actually have less chance of getting cancer than those who do not. That's probably garbage of course, but who knows for sure.
The pill I took was in a thick lead case, and the person who opened the case was wearing a full hazmat and lead protective suit. I was standing in the room with nothing on, and I picked up the pill and ate it. LOL My pee was pretty green for a day or so too.
What really bugs me is that my thyroid probably would not have gone nuts if it were not for my terrible diet of tons of table sugar at the time. I was shocking my system badly, and a proper diet at the time probably would have avoided the Grave's Disease in the first place.