  Source-less wave equations are derived for massless scalar, neutrino and
electromagnetic perturbations of a radiating Kerr space-time, and the Hawking
radiation of massless particles with spin $s =0, 1/2$ and 1 in this geometry is
investigated by using a method of the generalized tortoise coordinate
transformation. An extra interaction between the spin of particles and the
rotation of the hole displays in the thermal spectra of Hawking radiation of
massless particles with spin $s = 1/2, 1$ in the evaporating Kerr space-time.
The character of such effect is its obvious dependence on different helicity
states of particles with higher spin.
