The Green Glow of the Simpsons

This is flowing green. It's fluorescing. And if I turn off the black light, it stops glowing immediately. That differentiates it from phosphorescence where there's a delay between the absorption of the light and the readmission. But that's an example of an aspect of the electron configuration rather than the nucleus. Really 1% is what's giving us the ability to sort uranium 235 from U-238 which is the essential process.