Cerenkov radiation

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Light with a maximum of intensity in the blue spectral region, created when charged particles move in a translucent medium at a speed v, this being greater than the speed of light in this medium (v > c₀/n, c₀ = speed of light in a vacuum, n = refractive index). The threshold energy for the occurrence of Cerenkov radiation for electron radiation in water (n = 1.33) amounts to 260 keV.

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