I have a little tritium vial on my keys because I am a clumsy oaf with ADHD and the little greeny glow has been useful a couple of times. It's great when I'm out at night and my keys yeet themselves out of my pocket and land in the darkest possible area.
I mostly got it because it's cool though. Radioluminescence is fukken rad!
God, what a wonderful thread that was. I've decided to follow and star @mizu@lemmy.world so I can follow up on their future exploits.
Sadly, it doesn't appear that they've posted in quite some time. Hopefully they'll come out of hiding one day and ask more ridiculous questions.