Oh, and the odds of reacting to it are very very very very slim indeed.
Unless you have an allergic reaction to the radioactive isotope, no. They will soon see if you do react and counteract it.
There are no side effects.
You may be interested to know that I have had at least three that I can remember and there were no side effects whatsoever.
Ihave had a couple and have had no side effects at all permenent or temporary