Hi Bath, just wanted to say i am one of those horrible people that inject the radiation into people to do the test you had. I'm glad it all went well. And everything they told you is true, it is a TINY amount used for that test, much less than from a CT scan, and alot less than your annual natural background radiation exposure.
If you did want to express and use the milk tomorrow it would be ok. Also if there is a next time that you have to have a nuclear medicine test, you can always express beforehand and store some if you want.....
If you have any questions re the test pm me, more than happy to try and answer them.