Holding your baby after radiation??

An old friend of mine just posted on Facebook that she had a small dose of radiation on her neck today since she was in remission from cancer and they found a small lump. She said due to the radiation, she can't be around her kids for 2 days (even though it was very low dose).

Now I'm very concerned because my grandpa just had 2 CT Scans which give off a ton of radiation and my 1 year old went to visit him. He didn't touch her but I hugged him and then hugged my daughter. Plus, my mom watches my daughter Monday through Friday and she has been spending LOTS of time with my grandpa (her dad). Do I need to be concerned?