The blue glow is called Cherenkov radiation, and it's caused by very high energy electrically charged particles, such as electrons, traveling faster than the speed of light in a medium, such as water. Think of it like a sonic boom for light. In certain mediums, the speed of light is slower, and particles can travel faster than light in that medium. For example, the speed of light in water is 225,000,000 metres per second, compared to 299,792,458 metres per second in a vacuum, or about 75% the sp

A demonstration of Cherenkov radiation imaging in a whole body #radiationtherapy patient at the American Association of Physicists in Medicine (AAPM) 2018 meeting. DoseOptics is hoping to file for FDA market clearance next year. This video shows radiation dose as it is delivered, based on the Cheronkov effect radiation glow emitted from the patient and picked up by highly sensative image intensifier cameras synched with the dose delivery. This patient receives two doses, one for the upper body a

The Cherenkov Effect, why does radiation emit blue light?

Cherenkov Radiation | Definition & Production | nuclear-power.com

Un télescope Cherenkov à l'observatoire de Meudon

Achieving diffraction limited imaging with an Imaging Air Cherenkov Telescope