ifis the velocity of the particle. For most cases, energies are high enough for us to assumeFrom the diagram above, we can see that the light cone formed in Cerenkov radiation has a valueThe radiation appears as a continuous spectrum. In a dispersive medium, bothandare functions of the frequency of radiation. The number of photons at a particular frequency or wavelength, as it turns out, is proportional to This means that, in the visible range, blue light predominates over all other colours. The blue glow that emanates from the water in which highly radioactive nuclear reactor fuel rods are stored is caused by the Cerenkov effect. For fuel rods, much of the radiation they emit is in the form of high energy electrons. The electrons travel through the water at a velocity greater than that of light in water and hence cause the characteristic Cerenkov glow''.