Radiophobia is when people are afraid of anything related to radiation or nuclear technology. Imagine that you have a toy that you really like, but one day you accidentally drop it and it breaks. You may become afraid to play with toys similar to the one that broke because you don't want to feel sad if it breaks again. Radiophobia is kind of like that, but instead of a toy, it's about something you can't see called radiation.
Radiation is a type of energy that comes from atoms. Some people think that radiation is always a bad thing because it can make you really sick if you're exposed to too much of it. And if something bad happens with nuclear technology, like a nuclear power plant exploding, they might become really scared about anything related to radiation.
Radiophobia can make people worry about things like eating food grown near a nuclear power plant or being exposed to radiation from medical tests. But it's important to remember that these things are generally safe and made with safety in mind. It's okay to ask questions and learn more about radiation, but it's also important to not let fear control your life.