Why Nuclear Reactors Glow Blue: Cherenkov Radiation
The brilliant blue glow seen in some nuclear reactor pools is known as Cherenkov radiation. See how charged particles traveling through water can produce this distinctive blue light.
About This Video
The brilliant blue glow visible in the water surrounding some nuclear reactors is known as Cherenkov radiation.
Cherenkov radiation occurs when a charged particle travels through a transparent material, such as water, faster than light can travel through that material. The interaction produces electromagnetic radiation that can appear as a distinctive blue glow.
This OSHACode® visualization provides a close-up look at Cherenkov radiation inside a reactor pool and illustrates one of the most recognizable phenomena associated with nuclear science.
This video is part of the OSHACode® HAZWOPER Visual Library, a collection of technical safety, environmental, and scientific visualizations designed to make complex concepts easier to understand.
What Causes Cherenkov Radiation?
Cherenkov radiation is produced when a charged particle moves through a transparent material faster than light can travel through that material.
In a reactor pool, energetic charged particles can travel through the surrounding water at speeds greater than the reduced speed of light in water. As the particles interact with the material, they disturb its electromagnetic field and produce light.
The resulting radiation is commonly observed as the brilliant blue glow associated with operating research reactors and spent nuclear fuel stored underwater.
