My doctor told me the radioactive iodine I took had a 1/2 life of 8 days (I think that is what you meant instead of the thyroid hormorne). Also, mine told me that I was getting the smallest dose at 10 with the range being 10 to 16. Interesting, huh? Evidently, small is a subjective term with these guys.
And watch out, if you like the Holy Grail, you can easily turn into a Monty Python addict. His stuff was a craze of the ’70’s. “Bring out yer dead!”