  We extend the Gunion Bertsch calculation of gluon radiation in single
scattering to the case of finite mass quarks. This case applies to the
radiative energy-loss of heavy quarks of intermediate energies propagating in a
quark gluon plasma. We discuss more specifically the dead cone effect as well
as the mass hierarchy of the collisional and radiative energy loss and provide
some predictions for observables sensitive to the mass hierarchy of energy loss
in ultrarelativistic heavy ion collisions.
