Reed Research Reactor
TRIGA Mark I at 240 kW
There is a good explanation of the blue glow (Čerenkov radiation) on Wikipedia.
(click images to enlarge)
|Photo by Jeffrey Bradford, 1987||Photo by J.Michael Pollock, 1993|
|This picture is slightly overexposed.||Another overexposure, with the pool lights left on.|
|Photos by Mark Chen, 1998|