Hi, I'm a nuclear physicist. The reason for this is that virtually every piece of equipment in a nuclear lab can kill you instantly. This is because the bias voltages you apply to your lab equipment tend to be in the kilovolt range, because the interactions you're examining are at the MeV, GeV, or TeV range. Unfortunately that's enough to cross the skin and fry ya. Generally, you start off with safety briefings, circuitry classes, 3 years of supervision, hard safety equipment, say max current from bias sources in the milliamp range, ortec safety equipment. Basically like a toy kitchen set you'd give to a kid. Then you get older you get a little more freedom (A lot of people accidentally fry themselves with xrays at this point). Then when you get even older you have to grab the rope as the oldest guys die. Science is an RNG minecraft lootcrate where the number of keys you have is the number of bodies you throw at it. Just throw yourself in the trench until someone can walk over the pile of corpses.
It's really mundane and boring thinking for the 1000th time like "yeah that kilovolt supply can leak somewhere and kill me" "yeah this thing going critical could kill me" "yeah this voltage source could make some bad bremsstrahlung". You just move damned thing with a screwdriver and write the numbers down.
