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We discuss the transition radiation of a neutrino induced by its toroid dipole moment (τ) when crossing the interface between two different media with different refraction indices. A neutrino of 1 MeV energy emits approximately 10⁻⁴⁰ keV at τ=e 2 G _F/π ². This effect depends very slightly on the neutrino mass and has a finite value in the massless limit.