October 4, 2021
Light at the end of the… reactor!
The other week a group of colleagues and I were up in St. Petersburg on business. And in among our busy schedule while there we paid a useful and informative visit to the Leningrad Nuclear Power Plant. And it was there I got my first glimpse of Cherenkov radiation (and you thought radiation was invisible?), which I’d dreamed of doing for years. I also stood on the roof of a working reactor of RBMK (Reaktor Bolshoy Moshchnosti Kanalniy, meaning ‘high-power channel-type reactor’). An unforgettable experience!
Note: since there’s absolutely no photography allowed at any nuclear facility, the photos below are all taken from the internet.
So, the main thing: Cherenkov radiation. In case you haven’t clicked the link, here’s what it says about it on its Wikipedia page: ‘Cherenkov radiation is electromagnetic radiation emitted when a charged particle (such as an electron) passes through a dielectric medium at a speed greater than the phase velocity (speed of propagation of a wave in a medium) of light in that medium’ (the links –added by me).
And you can actually see this wonder of physics – and beautiful it is too: a fluorescent blue in the core of a nuclear reactor in cooling fluid. The spectacle is a cosmically fantastic one…
(photos from Wikipedia and here)