[RadioAstronomer]

At UIUC there was (it's now gone) a Triga-A bathtub reactor. I sat on the edge with it "cranked" up into the megawatt range and watched the core glow an incredible blue from the Cherenkov radiation. :-)

[cinFLA]

At UIUC there was (it's now gone) a Triga-A bathtub reactor. I sat on the edge with it "cranked" up into the megawatt range and watched the core glow an incredible blue from the Cherenkov radiation. :-)

I have a bunch of photos of commercial plants during refueling. The Cherenkov radiation can be seen even when they are shut down.