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Recently determined next-to-leading order sets of polarized partondistributions are used to study large-p_T $\vec{p}\vec{p}\rightarrow \gamma+X$at $\sqrt{s}=38, 100 and 500 GeV$. Certain conversion terms, necessary to usethe above sets, are determined. It is concluded that, to distinguish betweenthe above sets, planned RHIC experiments should be successful, in particular atc.m. photon pseudorapidity $\simeq 1$, and that a proposed HERA-$\vec{N}$ fixedtarget experiment should have rather large accuracy at relatively large $x_T(=2p_T/\sqrt{s})$.Comment: 9 pages, 5 figures available from authors. To be published in Phys.  Rev.

Direct photon production in polarized hadron collisions at collider and fixed target energies