I have been on a few tours. They are booked out with the experiments for the next 12 years. It's crazy. On one tour I was translating the operator to a Chinese delegation (engl. not Chinese) fun part was that I was only understanding half of what he said. Then I guess the audience then understands another 10% of that 🤦♂️
When you take a tour they gave me also a Geiger counter for exposure to radiation. Not sure what experiments had the radiation particles involved.
Arghhhh. 10% may still be better than 0 ^^
Maybe more to make people feel safe, as the probability to get irradiated may be pretty low. At the LHC, you need to have one if you go down often, I think (if I remember well as this is now many years I have been down into it).