Erin,
I had RAI in Feb. I have a 4 year old and a now 16 month old. I went to stay at my Mother’s (it was suggested that either I or the kids go). I stayed there Friday night after the treatment (the weekend thing worked out well) and didn’t go back home until Monday after work. But when I did return I still slept in a separate room from my husband, kept my utensils separate, flushed multiple times, and tried to not hold the baby in my lap until Friday.
Good Luck. I am starting to feel better now although I still can’t do without my Propranolol yet.