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Cherenkov detector

device
Also known as: Čerenkov detector, Cherenkov counter

Quick Summary

A Cherenkov detector is a device used to detect charged subatomic particles moving at high velocities. It works by sensing Cherenkov light, which is emitted when a charged particle travels through a transparent medium faster than the speed of light in that medium. This phenomenon is analogous to a sonic boom created by an airplane exceeding the speed of sound.12

While no particle can exceed the speed of light in a vacuum, they can exceed it in a medium with a refractive index n, where the particle's velocity v is greater than c/n. This effect is often observed as a faint blue glow in the water surrounding nuclear reactors, caused by electrons moving faster than light in water. Cherenkov detectors are sensitive to this light, which is emitted in a forward-directed cone.21

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