Hey just a little suggestion I've been wanting to make for a bit, it's about geiger counters, you know, the devices used to detect radiation.
The basic idea is that its an item you can hold one in your inventory, and once you get close to radioactive items like uranium, iridium or anything else like a reactor it would start making the familiar ol' geiger counter sound which would indicate presence of radioactive materials nearby, It would intensify the closer you get to the source, this would be very cool and could even help you in some situations.