  We calculate the nuclear dependence of direct photon production in
hadron-nucleus collisions. In terms of a multiple scattering picture, we
factorize the cross section for direct photon production into calculable
short-distance partonic parts times multiparton correlation functions in
nuclei. We present the hadron-nucleus cross section as $A^{\alpha}$ times the
hadron-nucleon cross section. Using information on the multiparton correlation
functions extracted from photon-nucleus experiments, we compute the value of
$\alpha$ as a function of transverse momentum of the direct photon. We also
compare our results with recent data from Fermilab experiment E706.
