Cherenkov radiation
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Cherenkov radiation is a glow of light produced when a charged particle, like an electron, travels through a material faster than light can travel through that same material. It matters because it helps scientists detect and study high-energy particles in physics experiments, and it's used in medical imaging and other practical applications.
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Cherenkov radiation glowing in the core of the Advanced Test Reactor at Idaho National Laboratory
Cherenkov radiation (/tʃəˈrɛŋkɒf/) is an electromagnetic radiation emitted when a charged particle (such as an electron) passes through a dielectric medium (such as distilled water) at a speed greater than the phase velocity (speed of propagation of a wavefront in a medium) of light in that medium. A classic example of Cherenkov radiation is the characteristic blue glow of an underwater nuclear reactor. Its cause is similar to the cause of a sonic boom, the sharp sound heard when faster-than-sound movement occurs. The phenomenon is named after Soviet physicist Pavel Cherenkov.