text: how are other people at risk after radio active iodine treatment? i have gone through radio active iodine treatment..i want to know how people around me are at risk.. what will happen to them if exposed you can actually contaminate others with the radiation. however the risk is small and it depends on how much radiation therapy you recieved as well.   radio active iodine (rai) is passed out of the body through all bodily fluids such as stool, urine, saliva and sweat therefore these are all potential forms of contamination.   radiation exposure is directly related to the amount of time you spend with another person as well as how intimate and close your contact is with them. avoid prolonged, intimate physical contact with babies, children and pregnant women.   for a pretty easy site to follow, try http://cpmcnet.columbia.edu/dept/thyroid/raiprep.html  good luck with your treatment and get well soon!