Two summers ago, I went to Vienna, Salzburg and Berlin. I started and ended in NY. While in the US, you can ask for a hand inspection and they must oblige, the EU doesn't have a policy like this. So there were a few zaps of carry-on luggage in the EU, plus the handful of film I brought with me into the Reichstagsgebäude. So that's 3 zaps for most rolls with a handful getting 4. No issues with development. I even marked the ones that got four zaps of x-rays instead of three to see if there would be a difference since I had no idea how strong the x-rays were there. Not a single problem.

Film included:
Adox CMS 20
Neopan 1600
Provia 100F
Provia 400x