  We investigate the radiative break-up of a highly energetic quark or gluon in
a high-temperature QCD plasma. Within an inertial range of momenta $T \ll
\omega \ll E$, where $E$ denotes the energy of the original hard parton (jet)
and $T$ the temperature of of the medium, we find that, as a result of the
turbulent nature of the underlying parton cascade, the quark to gluon ratio of
the soft fragments tends to a universal constant value that is independent of
the initial conditions. We discuss implications of this result to jet quenching
physics and the problem of thermalization of the quark-gluon plasma in heavy
ion collisions.
