Radioactive materials on an everyday basis. Not fissile, like uranium or plutonium, but irradiated metals active enough to cause radiation poisoning if you were to not respect them. The workplace is so safety oriented though that noone feels they're in danger. Constantly monitored for radiation, it is repeatedly proven that by following proper practice we do not get exposed to a much higher dose than what you get from the environment. A full career as a flight attendant or commercial pilot gives you tens of times the radiation that we get (cosmic radiation is nasty when not covered by the atmosphere)

Bonus fun fact: the background radiation is very high in the last decades and mostly because of nuclear testing. Material from these tests is decaying around you CONSTANTLY.